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Investigation on mechanical, thermal and water absorption properties of banana/coir reinforced polypropylene hybrid composites / Bujjibabu Gunturu in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 3-4 (08/2020)
[article]
Titre : Investigation on mechanical, thermal and water absorption properties of banana/coir reinforced polypropylene hybrid composites Type de document : texte imprimé Auteurs : Bujjibabu Gunturu, Auteur ; Chittaranjandas Vemulapalli, Auteur ; Ramakrishna Malkapuram, Auteur ; Nagarjuna Konduru, Auteur Année de publication : 2020 Article en page(s) : p. 123-131 Note générale : Bibliogr. Langues : Français (fre) Catégories : Composites à fibres végétales -- Propriétés mécaniques
Composites à fibres végétales -- Propriétés thermiques
Diffractométrie de rayons X
Fibres de banane
Fibres de coco
Flexion (mécanique)
Fourier, Spectroscopie infrarouge à transformée de
Humidité -- Absorption:Eau -- Absorption
Polypropylène
Résistance au chocs
Thermogravimétrie
Traction (mécanique)Index. décimale : 668.4 Plastiques, vinyles Résumé : This study explores the merits of B/C fibers reinforced polypropylene to developed high mechanical performance, cost effective and light weight hybrid composite. B/C fibers reinforced polypropylene hybrid composites were prepared with different proportions. Variation in Banana, Coir and B/C fibers in hybrid composites, reveal the tensile, flexural, impact strength and water absorption. The PP and Banana, Coir fibers reinforced Composites were prepared by the twin screw extrusion of PP 80% with B-20, C-20 and B/C 15/5, 10/10 and 5/15 wt%. After extrusion, the extraction strands cut into pallets and injection molded machine make the test specimens. It was found that maximum tensile strength, the flexural strength and the impact strength at 20% of banana fiber. Tensile, flexural and impact strengths marginally have been decreased when decrease the banana fiber in the B/C fiber reinforced polypropylene hybrid composites. Also observed water absorption of same composites for 24 hrs., 48 hrs. and 72 hrs. Thermogravimetry analysis (TGA), fourier transform infrared spectroscopy (FTIR) and XRD (X ray diffraction) was examined. Note de contenu : - MATERIALS AND METHODS : Materials - Manufacturing of composites - Mechanical testing - Water absorption - Thermal properties - FTIR - XRD (X-ray diffraction)
- RESULTS AND DISCUSSION : Tensile properties - Flexural properties - Impact strength - Water absorption - TGA &DTG - FTIR - XRD analysis
- Table 1 : Mechanical properties of B/C reinforced polypropylene hybrid composites
- Table 2 : Percentage of water absorption of B/C fiber reinforced polypropylene hybrid composite
- Table 3 : Functional groups of hybrid compositesDOI : https://doi.org/10.18280/rcma.303-402 En ligne : https://www.iieta.org/download/file/fid/39662 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37638
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 3-4 (08/2020) . - p. 123-131[article]Irradiation strategy for laser transmission welding of thermoplastics using high brilliance laser source / Mirko Aden in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)
[article]
Titre : Irradiation strategy for laser transmission welding of thermoplastics using high brilliance laser source Type de document : texte imprimé Auteurs : Mirko Aden, Auteur ; G. Otto, Auteur ; C. Duwe, Auteur Année de publication : 2013 Article en page(s) : p. 300-305 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Elastomères thermoplastiques
Irradiation
Matières plastiques -- Soudage
Polyamide 66
Polyéther bloc amide
Polymères -- Propriétés optiques
Polypropylène
Soudage laserIndex. décimale : 668.4 Plastiques, vinyles Résumé : This article describes the correlation between crystallinity degree and spatial seam homogeneity for laser transmission welding of polymers applying TWIST method, which is based on a superposition of slow regular feed and fast periodic circular or elliptical beam motion. Laser welding experiments and measurements of optical polymer properties (transmittance, reflectance and collimated transmittance) are reported for thermoplastic polypropylene PP and Polyamide PA66 as well as for thermoplastic elastomer PEBAX. The shape of the seam is visualized by measuring the heat affected zone (HAZ). Compared to the circular the elliptical motion leads to a homogeneous HAZ, which is advantageous for the welding process in many cases. Besides TWIST parameters, scattering of the laser radiation influences the welding result considerably. This is shown for high-crystallinity PA66, which needs more laser power to achieve similar weld seams than PP or PEBAX. The correspondence between homogeneous HAZ and good welding results is investigated by measuring the strength of welded T-shape samples with respect to the laser power. The elliptic TWIST motion leads to a broader processing window, if the ratio of the beam diameter and the major TWIST radius is smaller than a certain value (< 1/2). For PEBAX, a local maximum of strength-vs.-power curve is obtained for all TWIST® radii. For welding PP, the maximum is observed only for big radii. DOI : 10.3139/217.2732 En ligne : https://drive.google.com/file/d/1z-IaKY9Rb9wUW2UWbsZXDgkW0HpEI3aG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19019
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 300-305[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15238 - Périodique Bibliothèque principale Documentaires Disponible Joining of contact pins and conductive compounds via injection molding - Influence of the flow situation on the electrical contact resistance / Hans-Peter Heim in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 2 (05/2020)
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Titre : Joining of contact pins and conductive compounds via injection molding - Influence of the flow situation on the electrical contact resistance Type de document : texte imprimé Auteurs : Hans-Peter Heim, Auteur ; F. Mieth, Auteur ; André Schlink, Auteur ; K. Wiegel, Auteur ; L. Brabetz, Auteur Année de publication : 2020 Article en page(s) : p. 184-192 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Assemblages (technologie)
Assemblages multimatériaux
Broches métalliques
Composites -- Moulage par injection
Composites -- Propriétés électriques
Conduction électrique
Cuivre
Graphite
Insert (technologie)En plasturgie ou fonderie, un insert désigne une pièce d'un matériau infusible incluse dans la pièce fabriquée. Cet élément sert en général à la fixation ultérieure d'éléments mécaniques ou sert de renfort (exemple : chemise d'usure).
Mesures électriques
Polypropylène
Résistance de contact électriqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : While a lot of research can be found in the field of bulk resistance of carbon filled polymers, comparatively few papers focus on contact resistance between compound and metal contacts. Due to that small number of researches that deal with contact resistances, studies of the influence of injection molding conditions and parameters on the contact resistance are also very rare. In contradiction to that, these influences on bulk resistance have been studied. The objective of this work was to investigate the electrical contact resistance of overmolded tinplated copper contacts after modifying flow situations and molding conditions by procedural and constructional methods in contact areas. Metal pins were overmolded with a polypropylene compound containing 45 vol.% graphite, utilising an insert injection molding process. To affect the flow situation at the contacts, several processing parameters, such as mold temperature and injection speed, were modified. In addition, the contact alignment related to melt flow direction was varied. Electrical properties were studied and related to macroscopic and microscopic connection properties and flow situations in contact regions. It was found that the contact resistance is a significant factor while examining electrical resistances of overmolded samples. Furthermore, it was shown that the various flow situations had an essential impact on contact resistances. Weld lines at the position of the contact caused a decreased contact resistance. The correlation of the weld line effect, the filler orientation and contact resistance were successfully investigated by μ-CT. Regarding processing parameters, it was observed that a high mold temperature of 120 °C increased not only bulk conductivity, but also had a positive impact on contact conductivity. Macroscopic and microscopic connection mechanisms of contact surfaces were interpreted and connected to the experimental observations. Note de contenu : - Current status or research
- Materials
- Sample preparation
- Electrical measurements - Results
- Discussion : Macroscopic contact - Microscopic reproduction - Filler position within the interface - Connection of the filler particles close to the interfacesDOI : https://doi.org/10.3139/217.3879 En ligne : https://drive.google.com/file/d/19UY3Adlb4rpmXgeE9uXv5yEEUWG8Xsgf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34012
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 2 (05/2020) . - p. 184-192[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21674 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Keeping cool in the mass : Waterborne intumescent coatings can prevent thermoplastics from burning Type de document : texte imprimé Auteurs : Maude Jimenez, Auteur ; Sophie Duquesne, Auteur ; Serge Bourbigot, Auteur Année de publication : 2010 Article en page(s) : p. 26-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Intumescence (chimie)
Polycarbonates
Polypropylène
Revêtements
ThermoplastiquesUne 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 : 667.6 Peintures Résumé : Although intumescent coatings are widely used to protect wood and metal against fire, plastics are normally protected by adding materials to the bulk polymer, which may impair its strength. Waterborne intumescent coatings were shown to achieve a high standard of fire retardancy on two types of thermoplastic in two distinct types of fire test. En ligne : https://drive.google.com/file/d/17MVr_BSj3E562f60I4-K-0aeLEj6lPkH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10018
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 10/2010 (10/2010) . - p. 26-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012508 - Périodique Bibliothèque principale Documentaires Disponible Keeping track of elongation / Sven Wolf in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)
[article]
Titre : Keeping track of elongation : Online rheometers simplify the continuous evaluation of melt quality Type de document : texte imprimé Auteurs : Sven Wolf, Auteur ; Hans-Jürgen Luger, Auteur ; Jürgen Miethlinger, Auteur Année de publication : 2018 Article en page(s) : p. 36-40 Langues : Anglais (eng) Catégories : Composites à fibres
Matières plastiques -- Extrusion
Polyéthylène basse densité
Polypropylène
Rhéologie
Rhéomètres
ViscositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : In order to ensure efficient and cost-effective control of extrusion, the decisive parameters for melt quality must be determined during the process. Previously, only single points of the viscosity curve could be determined online. Now, with the help of special slit die geometry, a novel extrusion rheometer is able to measure shear and elongational viscosity – also inline. Note de contenu : - Patented hyperbolic elongation slit die
- Comparison with offline measurements
- Polymer preparation
- Polymer blend development
- Higher "resolution" with fiber compounds
- Application possibilities for the extrusion rheometer
- Conclusion another step towards industry 4.0
- Fig. Shear and elongation rheometer for online measurement : In the basic version, measurements are made with an (adjustable) fixed pump speed. The research versio can record complete elongational and shear viscosity curves automatically
- Fig. 1. Semi-hyperbolic slit die. Basic plan and side views of the pattented slit, and a detail of the height and width curves in the first and second transition zones
- Fig. 2. Basic measurement setup (without melt pump) in the extrusion rheometer. Melt flow for the inline measurement (with return)
- Fig. 3. Elongational and shear viscosity of LDPE-1840 H and PP-RA 130E as determined with online and offline measurement methods
- Fig. 4. Changes in the elongational and shear viscosity curves due to molecular degradation of PP-RA 130E after multiple processing
- Fig. 5. Shear and elongational viscosity curves of different polypropylene blends during the development of plastic recipes
- Fig. 6. Online measurement of polypropylene compounds with different amounts of glass fibers and natural fibers : Shear viscosity and elongational viscosity
- Fig. 7. Film production line with twin-screw and integral viscosity sensor : Example of an integrated plant layout that already existsEn ligne : https://drive.google.com/file/d/1Dj5sFYBrA_hl3unbqVN4p4pr9t3u8iql/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30092
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 36-40[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19625 - Périodique Bibliothèque principale Documentaires Disponible Laser produces conductive structures in KUNSTSTOFFE INTERNATIONAL, Vol. 99, N° 6/2009 (06/2009)
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