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Investigation of the effects of water uptake on the mechanical properties of wood dust particle filled Prosopis Juliflora reinforced phenol formaldehyde hybrid polymer composites / Ganesan Brindha in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 125-133 Titre : Investigation of the effects of water uptake on the mechanical properties of wood dust particle filled Prosopis Juliflora reinforced phenol formaldehyde hybrid polymer composites Type de document : texte imprimé Auteurs : Ganesan Brindha, Auteur ; Sujin Jose Arul, Auteur ; A. Haiter Lenin, Auteur ; Jani Stanly Kochappa Premila, Auteur Année de publication : 2024 Article en page(s) : p. 125-133 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Humidité -- Absorption:Eau -- Absorption Phénoplastes Poussière de bois Index. décimale : 668.4 Plastiques, vinyles Résumé : The water uptake behavior of Wood Dust (WD)/Prosopis Juliflora Fiber (PJF)/Phenol-Formaldehyde (PF) hybrid composites which are immersed in distilled and seawater environments was evaluated. Three different composite samples were fabricated by reinforcing WD and PJF with PF resin. The fabricated specimens were immersed in sea and distilled water to note down the moisture content absorption of the specimens for different time intervals from 0 to 240 h. The dry and wet specimens underwent mechanical properties testing as per ASTM standards and the findings for wet and dry specimens have been compared and analyzed. It is observed that the specimens which are immersed in sea (salt) water absorb more moisture content than the specimen immersed in distilled water and the PJF-rich (30 wt% of PJF & 10 wt % of WD) specimen absorbs more water than the other specimens. The water uptake behavior of the WD/PJF/PF hybrid composite follows a non-Fickian behavior. The mechanical performance (tensile, flexural, and impact) of the 10 wt % of WD 30 wt % of PJF specimen was better than that of other specimens at dry (before immersion) conditions and lost strength when immersed in sea and distilled water. SEM analysis was also done on the broken surface of the tested specimens which were exposed to the water environment. Note de contenu : - MATERIALS AND METHODS : Materials for fabrication - Composite fabrication - Testing - RESULTS AND DISCUSSION : Water absorption behavior - Diffusion coefficients - Effect of sea water immersion on composite properties - Scanning electron microscopy - Effects of distilled water immersion on composite properties DOI : https://doi.org/10.1515/ipp-2023-4407 En ligne : https://drive.google.com/file/d/1BFATWyfRO--PaaBsYF7TbSCWPE6NTNFg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40856 [article]

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Experimental investigation on mechanical and tribological analysis of pineapple leaf (Ananas comosus) and sisal (Agave sisalana) fibers reinforced hybrid epoxy composites / Natarajan Ponnusamy in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 134-142 Titre : Experimental investigation on mechanical and tribological analysis of pineapple leaf (Ananas comosus) and sisal (Agave sisalana) fibers reinforced hybrid epoxy composites Type de document : texte imprimé Auteurs : Natarajan Ponnusamy, Auteur ; Manoharan Mohanraj, Auteur ; Murugesan Kumar, Auteur ; Selvaraj Sathish, Auteur Année de publication : 2024 Article en page(s) : p. 134-142 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ananas et constituants Bases (chimie) Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Epoxydes Extraction (chimie) Fibres de sisal Le sisal (Agave sisalana) est une plante de la famille des Agavaceae originaire de l'est du Mexique où on la trouve également sous l'appellation de henequén. Sisal est également le nom de la fibre extraite des feuilles de cette plante. Très résistante, cette fibre sert à la fabrication de cordage, de tissus grossiers et de tapis. Le sisal est utilisé dans la filière bois pour tous les produits liés destinés au bois énergie et à la trituration (papeterie, panneau de particules). Leur stockage est de courte durée (le sisal est peu durable) et cette fibre végétale peut être mélangée au bois (ne pollue pas la matière comme une fibre synthétique). Humidité -- Absorption:Eau -- Absorption Traitement chimique Tribologie (technologie) Index. décimale : 668.4 Plastiques, vinyles Résumé : In many industrial applications, natural-fiber-reinforced polymer (NFRP) composites are emerging as a strong substitute for composites based on synthetic fibers. The goal of this study was to examine the mechanical and tribological characteristics, including tensile, flexural, impact, wear, hardness, and water absorption, of hybrid epoxy composites reinforced with pineapple leaf and sisal fibers at various weight fractions. First, 5 % sodium hydroxide was used to treat the pineapple leaf and sisal fibers. With a composition of 0, 10, 15, 20, and 30 wt% of pineapple leaf and sisal fibers to the epoxy resin and its hardener mixture, which had a constant weight ratio of 70 %, hybrid composites were fabricated using the compression moulding process. To create a hybrid epoxy composite reinforced with pineapple and sisal fiber, epoxy resin was used as the binder. Different types of testing were performed on the hybrid composites following ASTM standards. The outcomes were contrasted with composites made from mono-pineapple and sisal fiber composites. In comparison to other composite samples, the 15:15 composite sample exhibited the best mechanical and tribological qualities, including the highest tensile strength, impact resistance, flexural strength, hardness, water absorption resistance, and wear resistance. Using a scanning electron microscope (SEM), the fiber/matrix adhesion was investigated. The 15:15 composite sample exhibits primarily mechanical and tribological properties, making the resultant composite material simpler to use in structural and automotive applications. Note de contenu : - EXPERIMENTAL WORK : Materials - Fiber extraction and alkali treatment - Fabrication of pineapple and sisal natural fiber composites - Mechanical and tribological testing - RESULTS AND DISCUSSION : Tensile strength of natural fiber composites - Flexural strength of natural fiber composites - Impact strength of natural fiber composites - Hardness of natural fiber composites - Water absorption behavior of natural fiber composites - Wear characteristics of natural fiber composites - Surface morphology investigation of wear specimens - SEM micrograph analysis of tensile fractured specimens DOI : https://doi.org/10.1515/ipp-2023-4433 En ligne : https://drive.google.com/file/d/1Mzc-sh6tqaI7TNNQGWRfhn5R70ovfwEo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40857 [article]

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An experimental study of weave pattern effect on the mechanical and dynamic behavior of composite laminates / Rafik Halimi in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 143-151 Titre : An experimental study of weave pattern effect on the mechanical and dynamic behavior of composite laminates Type de document : texte imprimé Auteurs : Rafik Halimi, Auteur ; Fares Mohamed Laid Rekbi, Auteur ; Oussama Mimouni, Auteur ; Özkan Özbek, Auteur ; Wahiba Djerir, Auteur ; Amine Rezzoug, Auteur Année de publication : 2024 Article en page(s) : p. 143-151 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des défaillances (fiabilité) Analyse mécanique dynamique Composites à fibres de verre Composites à fibres de verre -- Propriétés mécaniques Composites à matrice organique Epoxydes Stratifiés Tissage Tissés Index. décimale : 668.4 Plastiques, vinyles Résumé : The current work aimed at investigating experimentally the weave pattern effects on the mechanical and dynamic behaviors of polymer matrix composite laminates. The laminates composed of three different weave types (plain, satin, and twill) of woven glass fabric and STR Medapoxy epoxy resin were fabricated via vacuum molding. Static bending experiments were applied to determine the influence of the weave pattern on the mechanical characteristics of the samples. The failure behaviors of the samples were also examined by optical and Scanning Electron Microscopy (SEM) analyses. Additionally, Dynamic Mechanical Analysis (DMA) in the temperature range of 25–200 °C at 1 Hz frequency was conducted to investigate the dynamic characteristics of the samples. It was found that the samples having satin weave type had the best flexural modulus followed by the plain and twill weaves. However, the twill weave laminates exhibited better storage modulus at glass transition temperature values (T g) compared to the others. Also, an increase of 3.3 °C in glass transition temperature was observed compared to that of neat resin. This was attributed to the better fiber/matrix adhesion and the lower molecular mobility in the polymer chain by the addition of glass twill fibers. Note de contenu : - MATERIALS AND METHODS : Materials - Manufacturing process - Mechanical characterization - RESULTS AND DISCUSSION : Mechanical response - Failure surface examination - DYNAMIC MECHANICAL PROPERTIES : Storage modulus - Damping factor DOI : https://doi.org/10.1515/ipp-2023-4435 En ligne : https://drive.google.com/file/d/16C9nA5m4B-S0oHIYY5ElHQ2xXwz6JtFY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40858 [article]

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Structuring step dependent characteristics in joining using pin-like structures in the vibration welding process / Michael Wolf in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 152-161 Titre : Structuring step dependent characteristics in joining using pin-like structures in the vibration welding process Type de document : texte imprimé Auteurs : Michael Wolf, Auteur ; Dietmar Drummer , Auteur Année de publication : 2024 Article en page(s) : p. 152-161 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Assemblages multimatériaux Collage Essais (technologie) Polyamide 66 Polymères semi-cristallins Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : With this study, correlations in the structuring step of pin-like joining were derived. Increased friction energy due to higher amplitude or force leads to a reduction in structuring time. Changes in thermo-mechanical properties for humid specimens result in increased process times. The theoretical geometry of the pin-like structures is well reproduced in the lower pin area, regardless of the process control. In the upper pin area, increased force and amplitude results in increased defects and air inclusions as a result of an accelerate and more inhomogeneous pin formation. Humidity does not affect the general pin geometry, but should be avoided due to increased air inclusions that can weaken the structure. For the multi-material joints, high bond strengths of up to 30 % of the base material (max. 50 % possible with the geometry used) can be achieved. Therefore, a minimum undercut is required. Once this is reached, the pin defects and the corresponding pin-foot ratio are decisive for the resulting bond quality. Note de contenu : - EXPERIMENTAL SECTION : Materials and test specimens - Joining using pin-like structures - Test methods - RESULTS : Structuring time - Geometrical shape of pin-like structures - Bond quality DOI : https://doi.org/10.1515/ipp-2023-4419 En ligne : https://drive.google.com/file/d/1QnkHu1YxnHCiqygh4ajdy3FSfO7t5ex0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40859 [article]

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Fabrication of expandable graphite and soybean oil-based synergistic modified polyurethane foam with improved thermal stability and flame retardant properties / Xu Zhang in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 162-175 Titre : Fabrication of expandable graphite and soybean oil-based synergistic modified polyurethane foam with improved thermal stability and flame retardant properties Type de document : texte imprimé Auteurs : Xu Zhang, Auteur ; Zhaoqian Wang, Auteur ; Simiao Sun, Auteur ; Yiming Wang, Auteur ; Zhi Wang, Auteur ; Hua Xie, Auteur Année de publication : 2024 Article en page(s) : p. 162-175 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse toxicologique Caractérisation Fumée -- Analyse Graphite Huile de soja Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Mousses plastiques Mousses plastiques -- Propriétés thermiques Polyuréthanes Pyrolyse La pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation. Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente. Stabilité thermique Thermogravimétrie Index. décimale : 668.4 Plastiques, vinyles Résumé : Biomass soybean oil-based polyol rigid polyurethane foam (RPUF) was modified and prepared by expandable graphite (EG). The effects of EG on the thermal stability and flame retardant properties of soybean oil-based polyol RPUFs were investigated by thermogravimetric analysis, pyrolysis kinetic analysis, conical calorimetry and flue gas toxicity analysis. The results showed that modified RPUF (RPUF-4) with EG content of 20 wt% had the highest initial and end temperatures, the highest activation energy E, the lowest Ds (17.6), and the highest light transmittance (73.6 %). At the same time, RPUF-4 had the lowest heat release rate (10.1 and 16.5 kW/m2), the lowest total heat release (1.5 and 2.1 MJ/m2), and the lowest average toxic gas emissions. The current study indicated that RPUF-4 had better thermal stability and flame retardant performance, which provided a useful reference for subsequent biomass flame retardant modified RPUFs. Note de contenu : - EXPERIMENTS : Materials - Preparation of expandable graphite-modified soybean oil-based polyol RPUF - Measurement and characterization - RESULTS AND DISCUSSION : Thermogravimetric analysis - Pyrolysis kinetic analysis - CONE analysis - Smoke toxicity analysis - Flame retardant mechanism DOI : https://doi.org/10.1515/ipp-2023-4446 En ligne : https://drive.google.com/file/d/1e0td38u2VywAvkOImnGn9BuxxQfPRlN4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40860 [article]

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Fabrication of electrospun nanofiber from a blend of PVC and PHB / Pham Le Quoc in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 176-185 Titre : Fabrication of electrospun nanofiber from a blend of PVC and PHB Type de document : texte imprimé Auteurs : Pham Le Quoc, Auteur ; Dmitriy V. Anuchin, Auteur ; Roman O. Olekhnovich, Auteur ; Vera E. Sitnikova, Auteur ; Mayya V. Uspenskaya, Auteur ; Arina V. Kremleva, Auteur ; Nguyen Hong Thanh, Auteur Année de publication : 2024 Article en page(s) : p. 176-185 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Analyse morphologique Chlorure de polyvinyle Electrofilature Nanofibres Nanofibres -- Propriétés mécaniques Nanofibres -- Propriétés thermiques Poly-B-hydroxybutyrate Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work, the fabrication process of electrospun nanofibers from a blend of polyhydroxy butyrate (PHB) and polyvinyl chloride (PVC) has been investigated. PVC/PHB nanofibers have been fabricated from solutions using different PVC and PHB ratios. The influence of technical parameters of the electrospinning process on the fabrication, morphology, and diameter of nanofibers has been evaluated. The chemical structure and thermal properties of PVC/PHB have been studied. The results show that the diameter of PVC/PHB nanofibers increases as the PHB content increases. In addition, the optimal technical parameters of the electrospinning process for each PVC and PHB ratio are different. Infrared spectroscopy analysis revealed an enhancement of the crystalline phase of the polymer composite with increasing PHB content. The thermal properties of PVC/PHB nanofibers were evaluated through differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The change in PHB ratios leads to a change in the glass transition temperature of PVC/PHB nanofibers. The thermal degradation process of PVC/PHB includes two steps. Increasing the PHB content leads to an enhancement in the mechanical strength of PVC/PHB nanofiber mats; however, it also results in a reduction in tensile elongation. Based on the results of structural, morphological, interaction analysis, and mechanical properties of PVC/PHB nanofibers, this study contributes to the optimization of the fabrication of nanofibers from PVC and PHB. PVC/PHB nanofibers have the potential to be used for air filtration applications. Note de contenu : - Materials and methods - Results and discussion : Morphology of PVC/PHB nanofibers - IR spectrum of PVC/PHB nanofibers - Thermal properties of PVC/PHB nanofibers - Mechanical properties of PVC/PHB nanofibers DOI : https://doi.org/10.1515/ipp-2023-4443 En ligne : https://drive.google.com/file/d/1Mpk38LiSJIU7wctIsdemli_QzhX24rno/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40861 [article]

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Investigation of mechanical and tribological performance of wood dust reinforced epoxy composite under dry, wet and heated contact condition / Rajdeep Paul in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 186-201 Titre : Investigation of mechanical and tribological performance of wood dust reinforced epoxy composite under dry, wet and heated contact condition Type de document : texte imprimé Auteurs : Rajdeep Paul, Auteur ; Sumit Bhowmick, Auteur Année de publication : 2024 Article en page(s) : p. 186-201 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse morphologique Charges (matériaux) Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Epoxydes Essais accélérés (technologie) Humidité -- Absorption:Eau -- Absorption Poussière de bois Surfaces -- Analyse Tribologie (technologie) Index. décimale : 668.4 Plastiques, vinyles Résumé : Natural fibers have received a lot of attention from academia as well as industry in the context of sustainable materials. Since they are more environmentally friendly than traditional synthetic materials, their physico-mechanical and frictional properties such as porosity, moisture absorption, high strength, modulus, toughness, and wear resistivity make them appropriate for a variety of industrialized applications where issues involving a significant quantity of dumping must be taken into account. The paper introduces an attempt to use epoxy-based composites reinforced with wood dust for various applications. The composites are prepared with various wood filler stacks (0, 2.5, 5, 7.5, 10, and 12.5 wt%) embedded with epoxy resin and subjected to tensile and flexural testing. The highest ultimate tensile strength achieved at 7.5 wt% wood dust support is 22 MPa, whereas the highest flexural modulus is 0.48 GPa at 12.5 wt% composites. The composite’s wear properties is examined under dry, wet, and heated contact conditions using a pin-on-disk (POD) machine. In dry condition, coefficient of friction (COF) varies from 0.10 to 0.38 whereas, in wet condition, the value of COF decreased by 70–83 %. In heated state, the COF is increased by up to 15 % when varying the temperature from 40 °C to 80 °C. The composite exhibits better wear behavior in the lower filler support than in the higher filler support due to the sturdy connection between the matrix and filler. On the other hand, the wet state’s tribological performance is superior to the dry and heated states. During surface morphology analysis, it is found that various voids, crack formation, wear debris, and thin transfer layer formation take place on the composite. Note de contenu : - MATERIALS & METHODOLOGY : Filler preparation - Pre-treatment - Composite fabrication - CHARACTERIZATION TECHNIQUES : Mechanical properties - Wear testing - Surface morphology analysis - RESULTS AND DISCUSSIONS : Porosity fraction - Water absorption - Tensile attributes - Flexural characteristics - Wear and frictional performance - Surface morphology DOI : https://doi.org/10.1515/ipp-2023-4410 En ligne : https://drive.google.com/file/d/1y3f8kN9_X3DtWGDP0RWg-ldA0OjuLARr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40862 [article]

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Multi-layer co-extrusion blow molding / Erik Steinmetz in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 202-209 Titre : Multi-layer co-extrusion blow molding Type de document : texte imprimé Auteurs : Erik Steinmetz, Auteur ; Seamus Scanlon, Auteur ; Tyler Schneider, Auteur ; Joao Maia, Auteur Année de publication : 2024 Article en page(s) : p. 202-209 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bouteilles en matières plastiques Lignes de soudure Matières plastiques -- Extrusion Matières plastiques -- Soufflage Structures multicouches Index. décimale : 668.4 Plastiques, vinyles Résumé : Multi-layer co-extrusion via the layer multiplication technique and a blow-molding set-up were used to produce bottles with a 129-layered structure of a model system of alternating polystyrene (PS) and poly (methyl methacrylate) (PMMA) layers. This method shows layer retention and thickness control with the use of melt rotation during the extrusion process. Samples were extruded and deformed angularly at different rotation speeds, blow-molded into bottles, and the overall wall thickness and analysis of individual layer thicknesses were performed. Angular rotation leads to weld line deformation and a change in layer thickness above a critical rotation speed in which the weld lines, inherited in the extrusion of the tube structures, are suitably deformed helically leading to uniform deformation during the blowing process. This method has potentially large implications for single cavity blow molding processes where high-performance properties, e.g., high barrier, insulation, mechanical, are of upmost importance, potential industries include gas transport, specialty packaging, and medical. DOI : https://doi.org/10.1515/ipp-2023-4413 En ligne : https://drive.google.com/file/d/1pgaVIztl1hnohRVax5JlTdHcbIlTxk8m/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40863 [article]

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Predicting part quality early during an injection molding cycle / Lucas Bogedale in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 210-219 Titre : Predicting part quality early during an injection molding cycle Type de document : texte imprimé Auteurs : Lucas Bogedale, Auteur ; Stephan Doerfel, Auteur ; Alexander Schrodt, Auteur ; Hans-Peter Heim, Auteur Année de publication : 2024 Article en page(s) : p. 210-219 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Prévision technologique Procédés de fabrication Qualité -- Contrôle Surveillance électronique Index. décimale : 668.4 Plastiques, vinyles Résumé : Data-based process monitoring in injection molding plays an important role in compensating disturbances in the process and the associated impairment of part quality. Selecting appropriate features for a successful online quality prediction based on machine learning methods is crucial. Time series such as the injection pressure and injection flow curve are particularly suitable for this purpose. Predicting quality as early as possible during a cycle has many advantages. In this paper it is shown how the recording length of the time series affects the prediction performance when using machine learning algorithms. For this purpose, two successful molding quality prediction algorithms (k Nearest Neighbors and Ridge Regression) are trained with time series of different lengths on extensive data sets. Their prediction performances for part weight and a geometric dimension are evaluated. The evaluations show that recording time series until the end of a cycle is not necessary to obtain good prediction results. These findings indicate that early reliable quality prediction is possible within a cycle, which speeds up prediction, allows timely part handling at the end of the cycle and provides the basis for automated corrective interventions within the same cycle. Note de contenu : - MATERIALS AND METHODS : Datasets - MACHINE LEARNING METHODOLOGY : Nested cross-validation - Time series data as features - Targets and evaluation measures - Baselines - Regression algorithms - RESULTS AND DISCUSSION DOI : https://doi.org/10.1515/ipp-2023-4457 En ligne : https://drive.google.com/file/d/1yG2E7W9Alesxb5WygB2zkTpIZoQhXsAy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40864 [article]

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Optimizing laser-based micro-cutting for PMMA microfluidic device fabrication: thermal analysis and parameter optimization / Mst. Nasima Bagum in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 220-236 Titre : Optimizing laser-based micro-cutting for PMMA microfluidic device fabrication: thermal analysis and parameter optimization Type de document : texte imprimé Auteurs : Mst. Nasima Bagum, Auteur ; Md. Ahsan Habib, Auteur ; Choudhury Abul Anam Rashed, Auteur ; Md. Mehedi Hasan Kibria, Auteur ; Syeda Kumrun Nahar, Auteur Année de publication : 2024 Article en page(s) : p. 220-236 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Logiciels Microfluidique Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Usinage par laser Index. décimale : 668.4 Plastiques, vinyles Résumé : Laser processes have gained popularity in microfluidic device fabrication. This study aims to determine the optimal parameters for laser-based micro-cutting to achieve the desired width, depth, profile, and material removal, considering the thermal properties of PMMA. A CNC CO2 laser was used, and 29 trials tested various speed and power combinations. Two theoretical models based on trial results focused on depth and width. COMSOL Multiphysics FEA software estimated surface temperature. Theoretical depth estimation matched experimental data more accurately when the P/S ratio was below 0.15 and the scanning speed was set at 500 mm/s or 750 mm/s. At 500 mm/s, width estimation was most accurate, up to 30 W. At 750 mm/s, experimental width exceeded predictions. Material removal increased proportionally with increasing P/S ratio, but beyond a threshold of 0.15, material removal remained nearly constant despite rising heat input. Laser-cut track shape varied, resembling a ‘U’ at lower and a ‘V’ at higher ratios. The groove shape transitioned from ‘U’ to ‘V’ when the temperature surpassed 1200 K. A V-shaped groove required a temperature exceeding 1500 K. Optimization confirmed a microchannel depth of 0.197 mm, width of 0.256 mm, and ‘U–V’ channel shape achievable at 30 W and 200 mm/s scanning speed, with a surface temperature of 1325 K. Note de contenu : - EXPERIMENTAL SETUP, MATERIALS AND METHODS : Thermal model to estimate temperature using finite element analysis - Depth and width estimation - RESULTS AND ANALYSIS : The effect of laser power and scanning speed ratio on engraving depth - The effect of the ratio of laser power and scanning speed on engraving width - Relationship of P/Ss ratio, available heat, surface temperature, and material removal - The track shape and temperature - Regression model of depth, width, and temperature DOI : https://doi.org/10.1515/ipp-2023-4408 En ligne : https://drive.google.com/file/d/1LnSZxHQdLRJw2JiH3B7IQjEQ3qfQuG9v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40865 [article]

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Preparation of PVDF/PVA composite films with micropatterned structures on light-cured 3D printed molds for hydrophilic modification of PVDF / Shengkai Li in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 237-241 Titre : Preparation of PVDF/PVA composite films with micropatterned structures on light-cured 3D printed molds for hydrophilic modification of PVDF Type de document : texte imprimé Auteurs : Shengkai Li, Auteur ; Zhengyang Jin, Auteur ; Yutong Chen, Auteur ; Changpeng Shan, Auteur ; Yan Xu, Auteur Année de publication : 2024 Article en page(s) : p. 237-241 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomatériaux Composites polymères Films plastiques Hydrophilie Impression tridimensionnelle Microstructures Mouillage (chimie des surfaces) Polyacétate de vinyle Polyfluorure de vinylidène Index. décimale : 668.4 Plastiques, vinyles Résumé : Polyvinylidene fluoride (PVDF) is widely used in biotechnology due to its excellent biocompatibility, high temperature and pressure resistance, and outstanding mechanical properties. However, the hydrophobic nature of PVDF surface hinders the attachment of biological proteins. In order to enhance the wettability of PVDF surfaces, this study prepared composite films by blending PVDF with polyvinyl alcohol (PVA), and micro-patterned structures were fabricated on the material surface using a mold-replication method based on digital light processing (DLP) photopolymerization printing technology. A series of characterization techniques including surface morphology analysis, chemical composition analysis, and wettability testing were employed. The surface morphology analysis results indicated that the method of using DLP photopolymerization technology to print mold replicas and create micro-patterned structures was indeed effective in creating micro-patterned structures on both PVDF and PVDF/PVA composite films. The chemical composition analysis showed that the spin-coating of PVDF powder material resulted in PVDF β-phase crystalline structure, which has a positive effect on cell growth. Furthermore, the introduction of hydrophilic groups was achieved by mixing PVDF with PVA. Wetting test results indicate that the incorporation of the hydrophilic material PVA and micro-patterned surfaces both contribute to the improved hydrophilicity of the material. The water contact angle of the micro-patterned PVDF/PVA composite film reached 30.8°, exhibiting excellent hydrophilic properties. This study achieved the optimization of PVDF surface properties through micro-patterned surface modification and material composition design, providing novel insights for the further development of PVDF materials in the field of biotechnology. DOI : https://doi.org/10.1515/ipp-2023-4464 En ligne : https://drive.google.com/file/d/1HjRbpKuOu8yn3kDpvtWj7LHfJlTg2Rqy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40866 [article]

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Evaluation of thermal contact resistance of molten resin–mold interface during high-thermal-conductivity polyphenylene sulfide filling in injection molding / Akifumi Kurita in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 242-259 Titre : Evaluation of thermal contact resistance of molten resin–mold interface during high-thermal-conductivity polyphenylene sulfide filling in injection molding Type de document : texte imprimé Auteurs : Akifumi Kurita, Auteur ; Yohei Yoshimura, Auteur ; Makoto Suzuki, Auteur ; Hidetoshi Yokoi, Auteur ; Yusuke Kajihara, Auteur Année de publication : 2024 Article en page(s) : p. 242-259 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Interfaces (Sciences physiques) Interfaces solide-liquide Matières plastiques -- Moulage par injection Polysulfures de phénylène Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : High-thermal-conductivity polyphenylene sulfide (PPS) has both mechanical and heat dissipation properties, and its low weight and fuel efficiency make it a suitable replacement for metals in automobiles. However, this resin often causes filling defects in the injection molding process. This is due to the higher thermal conductivity, which causes the molten resin to solidify more quickly during the filling process. Therefore, it is important to predict the cooling and filling behaviors of the resin accurately using computer-aided engineering (CAE). Currently, many commercial software programs use thermal contact resistance (TCR) as the thermal boundary condition between the mold and resin. However, there is no established method to accurately evaluate TCR during filling with high spatial resolution and response, and the accuracy of CAE cannot be maintained. Therefore, we used thermography and a prismatic glass insert mold to thermally visualize and analyze the filling process of this resin. Consequently, we succeeded in evaluating TCR values with high spatial resolution and response. The obtained TCR values varied depending on the flow state and pressure. To further validate the obtained TCR values, we compared “the visualization results of real flow conditions” and “the flow prediction results of CAE considering the obtained TCR values”. Note de contenu : - MATHEMATICAL MODEL OF HEAT TRANSFER AND TCR EVALUATION METHOD - EXPERIMENTAL METHOD : Experimental method - In-process temperature distribution visualization system - Cavity shape, material, and molding conditions in TCR measurement experiments - Simulation of TCR measurements - EXPERIMENTAL RESULTS AND DISCUSSION OF TCR MEASUREMENT : Simulation results of TCR measurements - Visualization analysis of temperature distribution and evaluation results of TCR - VISUALIZATION ANALYSISI AND CAE OF FILLING BEHABIOR : Cavity shape, material, and molding conditions for partial thin-walled filling behavior tests - Results and discussion of visualization analysis of filling behavior of high-thermal-conductivity PPS - Results and discussion of CAE prediction of filling behaviour - SUMMARY AND FUTURE SCOPE - APPENDIX A : PHYSICAL PROPERTIES OF RESINS USED IN CAE DOI : https://doi.org/10.1515/ipp-2023-4448 En ligne : https://drive.google.com/file/d/152EnzAiJiBqS1C4mB_b7zhUBwk61AQrD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40867 [article]

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Effect of sinusoidal pulsating speed enhancement on the mixing performance of plastics machinery / Tianlei Liu in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 260-272 Titre : Effect of sinusoidal pulsating speed enhancement on the mixing performance of plastics machinery Type de document : texte imprimé Auteurs : Tianlei Liu, Auteur ; Tianwen Dong, Auteur ; Bangxiong Liu, Auteur Année de publication : 2024 Article en page(s) : p. 260-272 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Matières plastiques -- Extrusion Matières plastiques -- Extrusion -- Appareils et matériels Matières plastiques -- Moulage par injection Matières plastiques -- Moulage par injection -- Appareils et matériel Mélanges (chimie) Simulation par ordinateur Vibrations (mécanique) Tags : 'Excitation  pulsée'  'Echelle  de  ségrégation'  'Efficacité  du  mélange'  'Simulation  numérique' Index. décimale : 668.4 Plastiques, vinyles Résumé : Numerous vibration-assisted methods have been adopted to solve problems in polymer processing, but the introduction of vibration fields is typically done on small extruders or injectors in school laboratories and industrial research rooms, which profoundly limits the application of vibration technology. The purpose of this study is to put forward a simple vibration excitation method for all scale extruders or injection molding machines. To recover the mixing performance of that excitation method, a numerical investigation was carried out using the CFD software ANSYS POLYFLOW 19.2, and the analysis and comparison were made between the mixing performance of a simplified screw element with and without a sinusoidal pulsating speed field. The results showed that not all dynamic states with the superimposed excitation field have better mixing performance than the steady state without any pulsating field. Nevertheless, the introduction of a pulsating speed field under certain parameters setting can indeed enhance the stretching rate, reduce the separation scale, increase the mixing efficiency, and lower the screw force. These findings are of great importance and provide valuable references for the development and application of vibration-assisted molding technology in plastics machinery. Note de contenu : - MODELS AND METHODS : Differential pulsating speed system - Geometric model - Assumptions and control equations - Mixing characterization - Parameter setting - RESULTS AND DISCUSSION : Stretching rate - Segregation scale - Mixing efficiency - Shear stress DOI : https://doi.org/10.1515/ipp-2023-4459 En ligne : https://drive.google.com/file/d/1SIaDCVc-Qj_dTCyBpsaRZLBP5sID51hm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40868 [article]

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Experimental investigation on the mechanical and wear behavior of epoxy/Indian almond/peepal hybrid composites / X. Roshan Xavier in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 273-283 Titre : Experimental investigation on the mechanical and wear behavior of epoxy/Indian almond/peepal hybrid composites Type de document : texte imprimé Auteurs : X. Roshan Xavier, Auteur ; K. Suderson, Auteur ; K. Viswanath, Auteur ; D. Velmurugan, Auteur Année de publication : 2024 Article en page(s) : p. 273-283 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse morphologique Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Epoxydes Fibres d'amande Surfaces -- Analyse Tribologie (technologie) Index. décimale : 668.4 Plastiques, vinyles Résumé : Natural fiber-based hybrid composites are gaining more attention in industrial usage due to their low cost, environmental friendliness, and simplicity of processing. In this research, an effort was made to create hybrid natural composites using Indian almond and peepal fibers for applications in the automotive industry. Composites were prepared with different volume fractions of Indian almond and peepal fibers using the hand layup process. The mechanical and tribological properties of the composites were tested. The epoxy/40 wt% peepal composite showed superior performance compared to all other composites due to the better strength of peepal fiber. Moreover, the same composite displayed the least wear loss and coefficient of friction (COF). The present study confirms that peepal fiber composites match the strength properties of existing industrial composite materials, and that they may be some of the alternative composites for automotive applications. Note de contenu : - Tensile strength - Flexural strength - Impact strength - Hardness - Wear loss - Coefficient of friction (COF) - Morphology of worn-out surfaces - Morphology of tensile fractured samples - Comparison of mechanical properties of Indian almond, peepal and its composites DOI : https://doi.org/10.1515/ipp-2023-4440 En ligne : https://drive.google.com/file/d/1Gy5P2cT1knfcDmQ_alXD33JqRD8sUUlt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40869 [article]

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Exploration of the thermal and mechanical characteristics of polymethyl methacrylate-based copolymers : implications for wind turbine blades applications / Huimin Xue in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 284-292 Titre : Exploration of the thermal and mechanical characteristics of polymethyl methacrylate-based copolymers : implications for wind turbine blades applications Type de document : texte imprimé Auteurs : Huimin Xue, Auteur ; Chun Li, Auteur ; Jiayang Sui, Auteur ; Lifei Liu, Auteur ; Xiaokun Ma, Auteur ; Chenhong Liang, Auteur ; Weizhen Zhao, Auteur Année de publication : 2024 Article en page(s) : p. 284-292 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères -- Propriétés mécaniques Copolymères -- Propriétés thermiques Pales d'éoliennes Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Thermoplastiques Une matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire. Index. décimale : 668.4 Plastiques, vinyles Résumé : Wind turbine (WT) blade fabrication typically employs thermosetting resins, whose recycling challenges post-retirement have resulted in environmental pressures. Thus, there is an urgent need to develop a low-viscosity, high-performance, and recyclable material with excellent mechanical properties that is compatible with WT fabrication processes, serving as a viable alternative to traditional epoxy resins. Poly(methyl methacrylate) (PMMA) resin is considered a promising candidate for replacing epoxy resins. However, the mechanical properties of PMMA still require improvement. In this study, we investigated the effects of introducing copolymerized monomers on the comprehensive performance of PMMA resin without affecting its viscosity, examining the influence of these copolymerized monomers on the material’s thermal and mechanical properties. Meanwhile, the mechanical properties of the synthesized PMMA-based copolymers were compared with those of blade-specific epoxy resin (WD0135). The results revealed that compared to WD0135, the flexural strength and modulus of the prepared PMMA copolymers significantly increased to 96.6 and 3158.6 MPa, respectively, with a tensile strength reaching 74.2 MPa. Consequently, this series of PMMA-based resins demonstrates immense potential for large-scale material part fabrication via casting techniques. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of PMMA, P(MMA-co-BMA) and P(MMA-co-St) pre-polymer solutions - Preparation of heat-cured PMMA, P(MMA-co-BMA), P(MMA-co-St) and epoxy samples - Characterization - RESULTS AND DISCUSSION : Chemical structure analysis - Thermal analysis - Flexural properties - Tensile properties DOI : https://doi.org/10.1515/ipp-2023-4480 En ligne : https://drive.google.com/file/d/1-yb8axa405fbL976TqBGr_wxT7oOmQ1b/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40870 [article]

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