A novel non-planar transverse stretching process for micro-porous PTFE membranes and resulting characteristics / Y.-H. Chang in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 1 (03/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 1 (03/2018) . - p. 20-28 Titre : A novel non-planar transverse stretching process for micro-porous PTFE membranes and resulting characteristics Type de document : texte imprimé Auteurs : Y.-H. Chang, Auteur ; S.-C. Chen, Auteur ; T.-J. Wang ; J. Guo Année de publication : 2018 Article en page(s) : p. 20-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etirement (mécanique) Matériaux -- Epaisseur Membranes (technologie) Morphologie (matériaux) Polytétrafluoréthylène Porosité Taille des pores Index. décimale : 668.4 Plastiques, vinyles Résumé : Polytetrafluoroethylene (PTFE) micro-porous membranes were prepared from PTFE fine powder through extruding, rolling, and uniaxial longitudinally stretching. In contrast to conventional planar transverse stretching, a novel 3D mold design of non-planar transverse stretching process was employed in this study to produce micro-porous structure. The morphology, membrane thickness, mean pore size, and porosity of the PTFE membrane were investigated. The results show that the non-planar transverse stretched membranes exhibit more uniform average pore diameter with thinner membrane thickness. Morphological changes induced by planar and non-planar transverse stretching for pore characteristics were investigated. The stretching conditions, stretching temperature and rate, affect the stretched membrane. Increasing temperature facilitated the uniformity of pore size and uniformity of membrane thickness. Moreover, increase in stretching rate resulted in finer pore size and thinner membrane. Note de contenu : - EXPERIMENTAL : Establishment of non-planar transverse stretching - Membrane preparation and stretching process - Non-planar transverse stretching process - MEMBRANE CHARACTERISTICS : Measurement - Morphology of membranes - Thickness - Porosity, pore size and pore size distribution - RESULTS AND DISCUSSION : Thickness and micro-porous structure for longitudinally stretched membranes - Effect of non-planar transverse stretching on membrane thichness and micro-porous structure - Effect of non-planar transverse stretching on micro-porous structure for different positions - Effect of non-planar transverse stretching process to membrane DOI : 10.3139/217.3309 En ligne : https://drive.google.com/file/d/1brsjrn91SwpA4oVvHVH46L0MUbvatj1o/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30155 [article]

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Rheological characterization and thermal stability of different intrinsic viscosity poly(ethylene terephthalate) in air and nitrogen / S.-C. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 3 (07/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 3 (07/2016) . - p. 292-300 Titre : Rheological characterization and thermal stability of different intrinsic viscosity poly(ethylene terephthalate) in air and nitrogen Type de document : texte imprimé Auteurs : S.-C. Chen, Auteur ; X.-M. Zhang, Auteur ; M. Liu, Auteur ; J.-P. Ma, Auteur ; W.-X. Lu, Auteur ; W.-X. Chen, Auteur Année de publication : 2016 Article en page(s) : p. 292-300 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Caractérisation Essais accélérés (technologie) Groupement carboxyle Matières plastiques -- Séchage Poids moléculaires Polyéthylène téréphtalate Rhéologie Stabilité thermique Température Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : Four PET samples of different intrinsic viscosity values based on diverse manufacturing processes were characterized for their linear viscoelasticity using a parallel plate rheometer. Thermal stability and frequency sweep experiments were performed in the melt state at 270 °C. The influences of drying temperature, testing atmosphere (air or nitrogen), and preparation (granules vs. samples cut from compression molded sheets) were investigated. Results indicated that a higher drying temperature promoted complex viscosity significantly and compression molded sheets generated irreversible structural changes in harsh conditions. The samples measured in air decreased because of thermo-oxidation degradation, whereas that in nitrogen unexpectedly increased slightly because of polycondensation without surface renewal. The role of carboxyl end group towards PET thermal stability was found to be influenced by the atmosphere. Note de contenu : - EXPERIMENTAL : Materials - Intrinsic viscosity tests - Carboxyl end group analysis - Thermal analysis - Molecular weight characterization - Rheological measurements - RESULTS AND DISCUSSION : Performance analysis of PETs - Effect of drying on rheology behavior - Testing atmosphere - Processing PETs into sheets - IV analysis of residual PETs - Thermal stability DOI : 10.3139/217.3138 En ligne : https://drive.google.com/file/d/1vIbcKYjluJNrr003FVW-jzfU_SJyZ7pY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26641 [article]

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