The dynamic apparent viscosity of polymer melts during pulsatile extrusion flow with vibration force field / G.-J. He in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 1 (03/2008)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 1 (03/2008) . - p. 2-7 Titre : The dynamic apparent viscosity of polymer melts during pulsatile extrusion flow with vibration force field : Theory and experiment Type de document : texte imprimé Auteurs : G.-J. He, Auteur ; X.-C. Yin, Auteur ; J.-P. Qu, Auteur Année de publication : 2008 Article en page(s) : p. 2-7 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion:Polymères -- Extrusion Polypropylène Rhéologie Rhéomètres Viscosité Index. décimale : 668.9 Polymères Résumé : The dynamic apparent viscosity of polymer melts during pulsatile extruding flow with a vibration force field was studied on a self-made dynamic capillary rheometer (DCR). A theory that could reflect the vibration influence on the dynamic apparent viscosity was proposed. Due to the superposition of the vibration force field upon the steady shear flow, the phase difference between the shear stress and the shear rate could be chosen as a parameter to reflect the effect of vibration on the dynamic apparent viscosity. According to this theory, the average shear rate during pulsatile extrusion increased because of the existence of the phase difference, which caused the decrease of the dynamic apparent viscosity. The experimental results proved that the phase difference was reduced with the increase of vibration frequency, which resulted in a decrease in the dynamic apparent viscosity during the pulsatile extrusion. DOI : 10.3139/217.0002 En ligne : https://drive.google.com/file/d/1TtXJ7siyZ2rKogu1f7aVP0YkeuXfjF6C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2654 [article]

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Thermal and flexural properties and water absorption of caulis spatholobi residue fiber reinforced biodegradable poly(propylene carbonate) composites / W. Li in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 3 (07/2015) . - p. 350-358 Titre : Thermal and flexural properties and water absorption of caulis spatholobi residue fiber reinforced biodegradable poly(propylene carbonate) composites Type de document : texte imprimé Auteurs : W. Li, Auteur ; F.-Q. Chen, Auteur ; X.-C. Yin, Auteur ; J.-P. Qu, Auteur ; M. Yan, Auteur Année de publication : 2015 Article en page(s) : p. 350-358 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres végétales -- Propriétés mécaniques Composites à fibres végétales -- Propriétés thermiques Flexion (mécanique) Humidité -- Absorption:Eau -- Absorption Polycarbonate de propylène Le carbonate de polypropylène (PPC), un copolymère d'anhydride carbonique et d'oxyde de propylène, est un thermoplastique. Des catalyseurs tels que le glutarate de zinc sont utilisés dans sa polymérisation. Index. décimale : 668.9 Polymères Résumé : This paper investigated and compared the thermal and flexural properties and water absorption of natural caulis spatholobi residue fibers reinforced PPC/CSRF composites. Polypropylene carbonate (PPC) was reinforced by caulis spatholobi residue fibers (CSRF) which had been pretreated by continuous steam explosion. The effect of fiber content (10 to 60 wt%) on the properties and water absorption of PPC/CSRF biodegradable composites was investigated. The thermal properties of PPC/CSRF composites indicated that the addition of CSRF could improve the thermal stability of the composites. The flexural strength and modulus of the composites were found to be improved as the content of fiber increased. From the SEM micrographs, it was found that a small amount of fibers were pulled out on fractured surfaces of the composites, showing good network structure between the fiber and PPC matrix. The water absorption amount of the composites increased with increasing the fiber content. This paper demonstrates that the incorporation of low-cost and biodegradable caulis spatholobi residue fiber into PPC provides a practical way to produce completely biodegradable and cost-competitive composites with good mechanical properties. Note de contenu : - EXPERIMENTAL : Materials - Continuous steam explosion of caulis spatholobi residue - Preparation of PPC/CSFR composites - Differential scanning calorimetry (DSC) - Thermogravimetric analysis (TGA) - Dynamic mechanical analysis (DMA) - Mechanical testing - Morphology observation - Water absorption - RESULTS AND DISCUSSION : Dynamic mechanical properties analysis - Flexural properties analysis - Morphology - Water absorption DOI : 10.3139/217.3027 En ligne : https://drive.google.com/file/d/1tM6B3wNxtXe8wjalRvRq-PJFqKi1rJOg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24330 [article]

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