Fabrication of porous 3-D structure from poly(L-lactide)-based nanocomposite foam via enzymatic degradation / M. Bitou in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 5 (11/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 5 (11/2007) . - p. 446-454 Titre : Fabrication of porous 3-D structure from poly(L-lactide)-based nanocomposite foam via enzymatic degradation Type de document : texte imprimé Auteurs : M. Bitou, Auteur ; M. Okamoto, Auteur Année de publication : 2007 Article en page(s) : p. 446-454 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In order to prepare a porous three-dimensional (3-D) structure in biodegradable polyester materials we have conducted the enzymatic degradation of a poly(L-lactide) (PLLA)-based nano-composite foam, having a nanocellular structure, using proteinase-K as a degrading agent at 37°C. The surface and cross sectional morphologies of the foam recovered after enzymatic hydrolysis for different intervals were investigated by using a scanning electron microscope. The nanocellular material took up a large amount of water, which led to the swelling of the foam due to the large surface area inside the nanocelluar structure, and facilitated the enzymatic degradation of the PLLA matrix as compared with the bulk (pre-foamed) sample. Consequently, we have successfully prepared a porous 3-D structure as a remaining scaffold in the core part of the nano-composite foam, reflecting the spherulites of the crystallized PLLA. DOI : 10.3139/217.2073 En ligne : https://drive.google.com/file/d/1UTlOjc414hKXdKuOxLfIa7sYmMhpf65P/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2694 [article]

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Polymer/layered silicate nano-composites / M. Okamoto in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 5 (11/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 5 (11/2006) . - p. 487-496 Titre : Polymer/layered silicate nano-composites : Structure development and processing operations Type de document : texte imprimé Auteurs : M. Okamoto, Auteur Année de publication : 2006 Article en page(s) : p. 487-496 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Polymer/layered filler nano-composites (PLFNCs) offer remarkably improved mechanical properties with low inorganic filler loading. Major developments in this field have been carried out over the last one and half decades. However, we are far from the goal of understanding the mechanisms of the enhancement effects in nanocomposites. Continued progress in nanoscale control, as well as an improved understanding of the physicochemical phenomena at the nanometer scale, has contributed to the rapid development of novel PLFNCs. We describe nano-structure development and processing operations in PLFNCs. DOI : https://doi.org/10.3139/217.0012 En ligne : https://drive.google.com/file/d/1RzXMHSOZ96HyQ3x1Ok8D_3_ZVAgg-q7K/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2803 [article]

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Viscoplastic material modeling for the stretch blow molding simulation / S. Wang in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 2 (06/2000) . - p. 166-175 Titre : Viscoplastic material modeling for the stretch blow molding simulation Type de document : texte imprimé Auteurs : S. Wang, Auteur ; A. Makinouchi, Auteur ; M. Okamoto, Auteur ; T. Kotaka, Auteur ; M. Maeshima, Auteur ; N. Ibe, Auteur ; Takaharu Nakagawa, Auteur Année de publication : 2000 Article en page(s) : p. 166-175 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this paper, the viscoplastic material model of PET (polyethylene terephthalate), which is intended to be used in the FEM (finite element method) simulation of stretch blow molding process, has been studied. Material tests of PET were performed with the constant strain rates varying from 0.01 to 1 (1/s), at temperatures ranging from 90 to 150°C, based on the obtained data a two-stage model was proposed. The proposed model could precisely take into account the effects of strain hardening, strain rate sensitivity, variation of the hardening index, and temperature dependency. This model has been implemented into the nonlinear finite element code PBLOW3D, which is developed in the Riken, and its performance in the stretch blow molding simulation has been studied. It has been demonstrated that the proposed material model provides significant improvements, compared with two existing material models, in the simulation of the blow molding process of PET bottles. Note de contenu : - Material test and material modeling - Experiment - Initial conditions for FEM Simulation - Comparison in the stretching process - Comparison in the stretch blow molding process DOI : 10.3139/217.1582 En ligne : https://drive.google.com/file/d/1eMEtbbsK8W_u6p68vhjkFpdWA9ZpIEDT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16055 [article]

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