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Fluid-powered projectile-assisted injection molding : principles and developments / T.-Q. Kuang in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 2-15 Titre : Fluid-powered projectile-assisted injection molding : principles and developments Type de document : texte imprimé Auteurs : T.-Q. Kuang, Auteur ; T. Liu, Auteur ; Q. Feng, Auteur ; W.-W. Liu, Auteur ; H.-S. Liu, Auteur ; L.-S. Turng, Auteur Année de publication : 2020 Article en page(s) : p. 2-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Corps creux Elastomères Matières plastiques -- Moulage par injection Tubes Index. décimale : 668.4 Plastiques, vinyles Résumé : The fluid-powered projectile-assisted injection molding (FPAIM) technique can be used to produce wholly or partially hollowed plastic parts through the introduction of a projectile driven by pressurized fluid. It greatly improves the quality, applications, and design freedom of hollowed parts. The operation principles, variants, advantages and disadvantages, as well as the process factors of FPAIM, are discussed in detail in this paper. In addition, some developments of FPAIM in the areas of both-end openings, projectile, variable cross-section, pipes with branches, closed voids, and elastomeric hollow parts, as well as combinations with other processes, are also introduced. Some applications of FPAIM are briefly presented. Finally, the future development of the FPAIM technique is also discussed. Note de contenu : - PRINCIPLE AND VARIANTS OF FPAIM : Principle - Processes - ADVANTAGES AND DISADVANTAGES OF FPAIM : Advantages - Disadvantages of FPAIM - PROCESS FACTORS OF FPAIM : Molding materials - Projectile - Tool design - Processing parameters - DEVELOPMENTS OF THE FPAIM PROCESS : Both end openings - Projectile - Variable cross section - Pipes with branches - Closed voids - Elastomeric hollow bodies - In combination with other processes - Numerical simulation of FPAIM - APPLICATIONS DOI : https://doi.org/10.3139/217.3882 En ligne : https://drive.google.com/file/d/1UW0bToLAyDB74A8lvwUJBpuhvv_w-5Va/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33774 [article]

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Correlations between the hysteresis parameters determining the rolling resistance in rubber composites / Tiwen Xu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 16-25 Titre : Correlations between the hysteresis parameters determining the rolling resistance in rubber composites Type de document : texte imprimé Auteurs : Tiwen Xu, Auteur ; Z.-X. Jia, Auteur ; Y.-J. Chen, Auteur ; D.-M. Jia, Auteur ; Y.-Q. Wang, Auteur Année de publication : 2020 Article en page(s) : p. 16-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique Caoutchouc Caoutchouc nitrile-butadiène Caoutchouc styrène-butadiène Caractérisation Essais dynamiques Hystérésis L'hystérésis (ou hystérèse) et signifiant "après" ou "plus tard", est la propriété d'un système qui tend à demeurer dans un certain état quand la cause extérieure qui a produit le changement d'état a cessé. Pneus Résistance au roulement Index. décimale : 668.4 Plastiques, vinyles Résumé : Recently, the research on low rolling resistance tires attracted interest for its reduction of petrol consumption, which is related to the hysteresis loss of rubber composites. Here, four common methods representing the hysteresis loss of rubber composites in lab were contrasted to explore the potential connections between them. The results indicated that tan δ obtained by DMA showed good positive linearity with that obtained by RPA without distinguishing the rubber species and filler types, also for the positive relation between tan δ and hysteresis loop area (HLA). The rolling power loss (L) captured by the rolling resistance testing machine appeared to have a positive correlation with tan δ from DMA or RPA in NR composites, while a negative connection showed up in SBR composites. Further, considering the influence of strain on rolling energy loss, the 100% modulus was introduced leading to a good positive quadratic equation connection between tan δ/100% modulus and L in all common rubber composites. Note de contenu : - EXPERIMENTAL : Materials - Preparation of rubber composites - Testing and characterization - RESULTS AND DISCUSSION : FTIR spectra of NR and SBR - Parameters of rubber composites - Linear fitting of tan δ values obtained from RPA and DMA - Connections between hysteresis loops and hysteresis loss - Linear dependence of tan δ values on rolling power loss (L) - Nonlinear dependence of tan δ/100% modulus on rolling power loss (L) DOI : https://doi.org/10.3139/217.3751 En ligne : https://drive.google.com/file/d/1wfDhWrh4wHY26WHyu58qo1Ug6xi_zeQE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33775 [article]

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Global modeling for single screw extrusion of viscoplastics / A. Lewandowski in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 26-36 Titre : Global modeling for single screw extrusion of viscoplastics Type de document : texte imprimé Auteurs : A. Lewandowski, Auteur ; Krzysztof J. Wilczynski, Auteur Année de publication : 2020 Article en page(s) : p. 26-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis Matières plastiques -- Extrusion Modèles numériques Rhéologie Viscoplasticité Index. décimale : 668.4 Plastiques, vinyles Résumé : An extensive modeling study is presented on viscoplastic flows in the single screw extruder. An effective modeling procedure is developed, and fully three-dimensional Non-Newtonian FEM computations are performed to design the screw and die characteristics which may be implemented into the global model of the process. ANSYS Polyflow software is applied to model these viscoplastic flows. An analysis is performed for the flow with yield stress effects both in the screw and in the die. Screw characteristics and die characteristics are calculated and modeled for various viscoplasticity parameters. The effect of yield stress parameters on the extruder operation has been discussed. Note de contenu : - Yield stress analysis - Flow simulation - Die flow - Screw flow - Global modeling DOI : https://doi.org/10.3139/217.3866 En ligne : https://drive.google.com/file/d/1gEGPNCMpnqsgxuJnFgWCNtL8jZKznlMa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33776 [article]

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Enhanced dispersive mixing in twin-screw extrusion via extension-dominated static mixing elements of varying contraction ratios / H. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 37-49 Titre : Enhanced dispersive mixing in twin-screw extrusion via extension-dominated static mixing elements of varying contraction ratios Type de document : texte imprimé Auteurs : H. Chen, Auteur ; V. Pandey, Auteur ; S. Carson, Auteur ; Joao M. Maia, Auteur Année de publication : 2020 Article en page(s) : p. 37-49 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Caractérisation Energie mécanique Extrudeuse bi-vis Matières plastiques -- Extrusion Morphologie (matériaux) Polypropylène Polystyrène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : Twin screw extruders (TSE) are widely used in polymer blending and compounding operations, since the relatively high stresses they impart on melts and controllable residence times make them highly suitable for mixing operations. However, the mixing action in the industry-standard kneading blocks (KB) is shear-dominated and shear flows are inefficient for dispersive mixing compared with extensional flows. A novel static extensional mixing element (EME) was developed recently by our group with the objective of providing extension-dominated flow during blending and compounding. Dispersive mixing in the EME is provided by flow through stationary hyperbolic converging-diverging (C-D) channels placed along the screw. The improvements in dispersive mixing for immiscible blends using EMEs with wide hyperbolically channels, i.e., low contraction ratios, has been proved. In this work, we begin by performing computational investigations of more extreme contraction geometries to determine the design flexibility limits for the EME. The contractions again showed more extension-dominated flow patterns than the original EME, the drawback being the obvious increase in the pressure drop. However, at extremely high contraction ratios, the entry angle is so shallow that recirculation zones appear at the entrance, which are undesirable, implying that there are geometrical limits above which the EME ceases to be an effective dispersive mixer. Next, experimental validation on the EMEs with different degrees of aggressiveness of the C-D channel were performed and dramatic improvement in droplet breakup (dispersive mixing) in case of immiscible blends is clearly observed at all viscosity ratios and with increasing degree of EME aggressiveness. Note de contenu : - Design and computational validation - Experiments : Processing equipment - Rheological characterization - Morphological analysis - Results and discussion : Determining the effective viscosity ratio - Blend morphology - Pressure profiles - Specific mechanical energy DOI : https://doi.org/10.3139/217.3857 En ligne : https://drive.google.com/file/d/1-Hew6oS39-220Q_DMmkyDSmhjUgpt9-u/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33777 [article]

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EPDM-G-GMA toughening of straw/polypropylene composites : mechanical properties, thermal stability and rheological properties / Y. He in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 50-57 Titre : EPDM-G-GMA toughening of straw/polypropylene composites : mechanical properties, thermal stability and rheological properties Type de document : texte imprimé Auteurs : Y. He, Auteur ; H.-M. Wu, Auteur ; J.-B. Guo, Auteur ; W.-D. He, Auteur ; Y. Zhou, Auteur Année de publication : 2020 Article en page(s) : p. 50-57 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique Analyse thermique Caractérisation Composites à fibres végétales -- Propriétés mécaniques Composites à fibres végétales -- Propriétés thermiques Ethylène-propylène-diène monomère Paille Polypropylène Rhéologie Stabilité thermique Index. décimale : 668.4 Plastiques, vinyles Résumé : Natural fiber reinforced polymer composites have the advantages of low density, low cost and renewability. However, the inferior mechanical property restricts the application. In this work, EPDM-g-GMA has been added to straw/PP composites to improve the properties. The mechanical properties, thermal stability, crystallinity and melt viscosity have been invested. The results reveal that the mechanical properties of straw/PP/EPDM composites are improved remarkably and the impact strength more than doubles compared to straw/PP composites. Surface microstructure analysis reveals that the composite has good interfacial compatibility and dispersing performance. The maximum decomposition temperature, the melting enthalpy and crystallinity increased. The glass transition temperature and process ability are also improved by the addition of EPDM. Note de contenu : - EXPERIMENTAL : Materials and equipment - Composite preparation - Characterization - RESULTS AND DISCUSSION : Mechanical properties - Morphology - Thermal stability - DSC analysis - DMA analysis - Rheological properties DOI : https://doi.org/10.3139/217.3836 En ligne : https://drive.google.com/file/d/1EMazIVfzrlz6IUYkZoQSVSzJL9eijUmu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33778 [article]

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In situ assembly of LDPE/PA6 multilayer structure by stirring / P. Pongmuksuwan in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 58-69 Titre : In situ assembly of LDPE/PA6 multilayer structure by stirring Type de document : texte imprimé Auteurs : P. Pongmuksuwan, Auteur ; Wanlop Harnnarongchai, Auteur Année de publication : 2020 Article en page(s) : p. 58-69 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Assemblages (technologie) Couches minces multicouches Matières plastiques -- Extrusion Matières plastiques -- Propriétés mécaniques Morphologie (matériaux) Polyamide 6 Polyéthylène basse densité Rhéologie Structure cristalline (solide) Structures multicouches Index. décimale : 668.4 Plastiques, vinyles Résumé : A coextrusion apparatus was developed to fabricate low-density polyethylene/polyamide 6 (LDPE/PA6) multilayer films. Unlike the feedblocks used in conventional coextrusion, the apparatus consists of a stirring rod, which stretches and folds the polymer components. On rotating the stirring rod, the lower viscosity phase migrates to high shear regions (stirring rod surface), thereby contributing to the formation of a multilayer structure. The desired multilayer structure was achieved at the optimum stirring speed (0.013 m s−1), volumetric flow rate of LDPE (5.8 × 10−6 m3 s−1), and volumetric flow rate of PA6 (1.5 × 10−6 m3 s−1). The LDPE/PA6 multilayer film had higher tensile and puncture resistance properties compared to that produced from conventional coextrusion, indicating the potential of the proposed apparatus for multilayer polymer film production. Note de contenu : - EXPERIMENTAL : Raw materials - Film preparation - Test variables - Rheological properties - Morphological examination of the LDPE/PA6 multilayer - Determination of the crystallinity level - Mechanical properties of the as-extruded films - RESULTS AND DISCUSSION : Rheological properties - Morphologies of the LDPE/PA6 multilayer films - Mechanical properties of the as-extruded films DOI : https://doi.org/10.3139/217.3849 En ligne : https://drive.google.com/file/d/1aL-3rh_dmr1YvvQpPydWddnTxpSzH-YJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33779 [article]

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Modeling and estimation of the pressure and temperature dependent bulk density of polymers / Christian Kneidinger in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 70-82 Titre : Modeling and estimation of the pressure and temperature dependent bulk density of polymers Type de document : texte imprimé Auteurs : Christian Kneidinger, Auteur ; M. Längauer, Auteur ; Gernot Zitzenbacher, Auteur ; S. Schuschnigg, Auteur ; Jürgen Miethlinger, Auteur Année de publication : 2020 Article en page(s) : p. 70-82 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis Masse volumique Mesure Modèles mathématiques Polymères Pression Index. décimale : 668.4 Plastiques, vinyles Résumé : The bulk density of polymers is a crucial factor for the throughput and the pressure build-up of single screw plasticating units. It depends not only on the density of the polymeric material itself, but also on the geometry of the single pellets, on the dimensions of the screw channel and, furthermore, on the temperature and the pressure. A review of the existing models shows that there is potential for improvement, as their applicability is restricted. It is difficult to obtain model parameters, as they can only be determined by experiment, but there are only a few devices which enable temperature- and pressure-dependent bulk density to be measured. Furthermore, these devices are not standardized. This work presents a new model which can be used to calculate the bulk density as a function of pressure and temperature and an adapted approach that considers the dimensions of the single pellets and the screw channel. The model is verified by both, new data derived from experiments and data from the literature. Compared to existing models, this new model fits the experimental data better, requires fewer parameters and shows much better extrapolation behavior as well as a continuous changeover behavior at the melting temperature. Another big advantage of the new model compared to the existing ones is that the model parameters of this new model can be estimated from the stress at yield and from the melting temperature. This enables a rough estimation of the pressure and temperature dependent bulk density without having to measure it. Note de contenu : - INTRODUCTION : Measurement of the bulk density - Existing models - Evaluation of the existing models - PROPOSED MODEL : Material density - Adjustable approach - Simplified approach - Combined approach - Modification by implementation of the volumetric transition temperature - Modifications considering the temperature dependence of the bulk density at zero pressure - Consideration of the screw channel geometry - Benefits of the new model compared to the existing models - Parameter fitting - MATERIALS USED - RESULTS AND DISCUSSION - ESTIMATING MODEL PARAMETERS FROM MATERIAL PROPERTIES DOI : https://doi.org/10.3139/217.3876 En ligne : https://drive.google.com/file/d/1jH3kB_e72-_OymLxouI82g5CYVTN2VzK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33780 [article]

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Influence of ABS type and compatibilizer on the thermal and mechanical properties of PC/ABS blends / I. Debbah in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 83-94 Titre : Influence of ABS type and compatibilizer on the thermal and mechanical properties of PC/ABS blends Type de document : texte imprimé Auteurs : I. Debbah, Auteur ; R. Krache, Auteur ; N. Aranburu, Auteur ; A. Etxeberria, Auteur ; Rosario Benavente, Auteur Année de publication : 2020 Article en page(s) : p. 83-94 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Alliages polymères -- propriétés mécaniques Alliages polymères -- Propriétés thermiques Compatibilité chimique et physique Microscopie électronique à balayage Polycarbonates Terpolymère acrylonitrile butadiène styrène Thermogravimétrie Index. décimale : 668.4 Plastiques, vinyles Résumé : The present work aimed to study the influence of ABS type and compatibilizer on the thermal and mechanical properties of PC/ABS blends. For that, blends of PC with two types of ABS, with different rubber content, were prepared at 70 wt% of PC and 30 wt% of ABS, without and with compatibilizer at loadings of 1, 3 and 5 wt%. The effectiveness of those formulations was examined by means of morphological (SEM), thermal (DSC, TGA) and mechanical (tensile and microhardness) properties. It was shown that the compatibilizer had in general beneficial effects on the global properties of PC/ABS blends, and that the optimal amount of compatibilizer depends on the ABS type. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - CHARACTERIZATION : Scanning Electron Microscopy (SEM) - Thermal properties - Thermogravimetric analysis (TGA) - Mechanical properties - Microhardness - RESULTS AND DISCUSSION : Thermogravimetric analysis - Phase behavior - Mechanical properties - Microhardness - Effect of strain rate DOI : https://doi.org/10.3139/217.3858 En ligne : https://drive.google.com/file/d/1_3S8w5F_aIDK9j7WNb6wrrF-qtoWmu6S/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33781 [article]

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Analysis of self-reinforced mechanism of over-molding polypropylene parts / Y. Lu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 95-106 Titre : Analysis of self-reinforced mechanism of over-molding polypropylene parts Type de document : texte imprimé Auteurs : Y. Lu, Auteur ; K.-Y. Jiang, Auteur ; M.-J. Wang, Auteur ; Y. Zhang, Auteur ; Y.-Y. Liu, Auteur Année de publication : 2020 Article en page(s) : p. 95-106 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Calorimétrie Composites thermoplastiques auto-renforcés Essais dynamiques Matières plastiques -- Moulage par micro-injection Matières plastiques -- Propriétés mécaniques Matières plastiques -- Surmoulage Microscopie Morphologie (matériaux) Polypropylène Structure cristalline (solide) Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : On the premise that the overall structure and composition of the parts remain unchanged, the over-molding of self-reinforced polymer composites parts (OM-SRCs parts) prepared in this paper change the aggregation structure of the parts by combining multi-component sequential molding technology with micro-injection molding technology. Thus, it improves the comprehensive performance of the parts, and achieves the purpose of self-reinforcing. The morphological feature of self-reinforced parts during over-molding are obviously different from those formed by conventional injection molding, which also leads to differences in physical properties. In this study, two types of polypropylene parts of the same size (60 × 12 × 2 mm3) were prepared, and their micro-morphologies comparison were investigated by means of polarized light microscopy (PLM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). From the results, it was found that the tensile properties of OM-SRCs parts were improved by up to 9.46% compared with the conventional parts. Through PLM observation, it is found that the section shape of OM-SRCs parts perpendicular to the flow direction shows a double “skin-core” structure, resulting in the increase of the area ratio of skin layer to 24% (16% in conventional parts). SEM was carried out on the skin layer near the fusion position of the interface, and a highly oriented “shish-kebab” structure was observed. Through DSC and 1D-WAXD pattern analysis, it was found that the overall crystallinity of OM-SRCs parts decreased by 8.53% and 5.32% compared with the conventional parts, respectively. The 2D-WAXD pattern analysis showed that the molecular orientation degree of the skin layer of OM-SRCs parts increased by 15.65%. By means of the response surface method, the molecular orientation obtained was the decisive factor affecting the performance of OM-SRCs parts. By means of the least squares' minimization procedure, a dimensionless equation between the micro-morphologies and mechanical properties was established, which makes the “adjustability” of the sample performance be preliminarily realized. Note de contenu : - EXPERIMENTAL : Sample material - Sample size - Sample preparation - Tensile test - Polarized light microscopy (PLM) - Scanning electronic microscopy - Differential scanning calorimetry - Wide-angle x-ray diffraction analysis (WAXD) - RESULTS AND DISCUSSION : Mechanical properties - Microscopic observation - Polycrystalline composition and crystallinity - Crystalline molecular orientation - Morphology-mechanical properties relationship DOI : https://doi.org/10.3139/217.3872 En ligne : https://drive.google.com/file/d/14hDR4r6sRbCkxUGsInR-Y-6Dv0l2BiuQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33782 [article]

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Grafting of biodegradable polyesters on cellulose for biocomposites : characterization and biodegradation / Fatima Ezahra Tabaght in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 107-120 Titre : Grafting of biodegradable polyesters on cellulose for biocomposites : characterization and biodegradation Type de document : texte imprimé Auteurs : Fatima Ezahra Tabaght, Auteur ; A. El Idrissi, Auteur ; A. Benarbia, Auteur ; N. Achelhi, Auteur ; M. Aqil, Auteur ; S. El Barkany, Auteur ; R. Bellaouchi, Auteur Année de publication : 2020 Article en page(s) : p. 107-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Copolymères greffés Fourier, Spectroscopie infrarouge à transformée de Microfibres Morphologie (matériaux) Polybutylène succinate Polyesters Polyéthylène succinate Polymères -- Biodégradation Polymères -- Propriétés thermiques Polymères -- Solubilité Polymères -- Synthèse Polymères aliphatiques Résonance magnétique nucléaire 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 : Sustainable, biodegradable and thermoplastic processable aliphatic polyesters (polybutylene succinate (PBS) and polyethylene succinate (PES)) were prepared and characterized; then, they were grafted onto cellulose micro-fibers using a simple click reaction. This modification was conducted under simple experimental conditions. The characterization (NMR and FTIR analysis), thermal properties, solubility, morphology and biodegradation process of the all products prepared were established and studied. The results show that the solubility of the prepared derivatives is improved in comparison with cellulose, while their thermal stability showed a slight decrease compared to the starting materials. The composites derived from the modified cellulose show a slight decrease in their biodegradability in comparison with that of unmodified cellulose due to several parameters. Note de contenu : - EXPERIMENTAL : Materials - Synthetic procedures - Measurements - RESULTS AND DISCUSSION : Synthesis - Characterization DOI : https://doi.org/10.3139/217.3869 En ligne : https://drive.google.com/file/d/1cePAnbcCjKeWoi87P_ZawAt_jE5qvbXB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33783 [article]

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