Injection molded solid and microcellular polylactide compounded with recycled paper shopping bag fibers / A. Kramschuster in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 5 (11/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 5 (11/2007) . - p. 436-445 Titre : Injection molded solid and microcellular polylactide compounded with recycled paper shopping bag fibers Type de document : texte imprimé Auteurs : A. Kramschuster, Auteur ; S. Pilla, Auteur ; S. Gong, Auteur ; A. Chandra, Auteur ; Lih-Sheng Turng, Auteur Année de publication : 2007 Article en page(s) : p. 436-445 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Recycled paper shopping bag fibers were melt-compounded using a batch mixer with biobased/biodegradable polylactide (PLA) at 10 and 30 wt.% using silane as a coupling agent. These PLA/fiber composites were then injection molded to produce both solid and microcellular tensile bars. The mechanical properties (specific modulus, specific tensile strength, specific toughness, and strain at break) of the neat PLA and PLA composites were tested and the cell morphology of the microcellular samples was examined using scanning electron microscopy. It was observed that the addition of the recycled paper shopping bag fibers resulted in an increase in cell density and decrease in average cell size for the microcellular components when compared with the neat PLA. The addition of the fibers increased the specific modulus of both solid and microcellular components, and high fiber contents (30 wt.%) resulted in an increase in specific tensile strength, yet yielded a decrease in the strain at break and specific toughness. The storage modulus was also improved with the addition of 10 and 30 wt.% fibers for both solid and microcellular components. DOI : 10.3139/217.2063 En ligne : https://drive.google.com/file/d/1SZj3Ywt82RoXbqqCzfNEw6FA2C-ft5Wm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2685 [article]

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Single and multi objective optimization for injection molding using numerical simulation with surrogate models and genetic algorithms / J. Zhou in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 5 (11/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 5 (11/2006) . - p. 509-520 Titre : Single and multi objective optimization for injection molding using numerical simulation with surrogate models and genetic algorithms Type de document : texte imprimé Auteurs : J. Zhou, Auteur ; A. Kramschuster, Auteur ; Lih-Sheng Turng, Auteur Année de publication : 2006 Article en page(s) : p. 509-520 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The objective of this study is to develop an integrated computer-aided engineering (CAE) optimization system that can quickly and intelligently determine the optimal process conditions for injection molding. This study employs support vector regression (SVR) to establish the surrogate model based on executions of three-dimensional (3D) simulation for a selected dataset using the latin hypercube sampling (LHS) technique. Once the surrogate model can satisfactorily capture the characteristics of simulations with much less computing resources, a hybrid optimization genetic algorithm (GA) or a multi-objective optimization GA is then used to evaluate the surrogate model to search the global optimal solutions for the single or multiple objectives, respectively. The performance and capabilities of other surrogate modeling approaches, such as polynomial regression (PR) and artificial neural network (ANN), are also investigated in terms of accuracy, robustness, efficiency, and requirements for training samples. Experimental validations and applications of this work for process optimization of a special box mold and a precision optical lens are presented. DOI : https://doi.org/10.3139/217.0039 En ligne : https://drive.google.com/file/d/1mBD1yMeW8gfEGVhA3oz3Uz7RlSZ5rvE-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2806 [article]

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Solid and microcellular polylactide-carbon nanotube nanocomposites / S. Pilla in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 5 (11/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 5 (11/2007) . - p. 428-428 Titre : Solid and microcellular polylactide-carbon nanotube nanocomposites Type de document : texte imprimé Auteurs : S. Pilla, Auteur ; A. Kramschuster, Auteur ; S. Gong, Auteur ; A. Chandra, Auteur ; Lih-Sheng Turng, Auteur Année de publication : 2007 Article en page(s) : p. 428-428 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this study, polylactide (PLA)-multi-walled carbon nanotube (MWCNT) nanocomposites were melt-compounded using a twin-screw extruder. Solid and microcellular tensile bar specimens were produced via conventional and microcellular injection molding, respectively. Various characterization techniques were applied to study the static and dynamic mechanical properties, degree of MWCNT dispersion, cell morphology, and crystallization behavior. The addition of a small amount of MWCNTs led to a decrease in the cell size and an increase in the cell density of the microcellular PLA specimens. A transmission electron microscopy analysis of the PLA-MWCNT specimens revealed a higher degree of MWCNT dispersion in the microcellular PLA-MWCNT composite compared with its solid counterpart, indicating that the microcellular injection molding process further dispersed the MWCNTs. For both solid and microcellular specimens, the addition of 1.5 wt% MWCNTs reduced the specific strength, specific toughness and strain-at-break while exerting less impact on the specific modulus. The storage modulus was not affected significantly with the addition of MWCNTs, but was found to be higher for the microcellular specimens compared with their solid counterparts. Finally, the crystallinity of PLA increased with the addition of MWCNTs. DOI : 10.3139/217.2071 En ligne : https://drive.google.com/file/d/1n3G-UvKk_A8cvQnt6fkUh-5frZJOvCMF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2683 [article]

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Study of shrinkage and warpage in microcellular co-injection molding / C. Shen in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 4 (09/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 4 (09/2006) . - p. 393-401 Titre : Study of shrinkage and warpage in microcellular co-injection molding Type de document : texte imprimé Auteurs : C. Shen, Auteur ; A. Kramschuster, Auteur ; D. Ermer, Auteur ; Lih-Sheng Turng, Auteur Année de publication : 2006 Article en page(s) : p. 393-401 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This study investigated the effects of processing conditions on the shrinkage and warpage behavior of a box-shaped, polypropylene part created using a special microcellular co-injection molding process. Results were compared to the shrinkage and warpage of conventional and microcellular injection molded parts. A preliminary study was performed to determine processing condition limits and the steady state conditions for each combination of molding parameters. A 26–1 fractional factorial design of experiments (DOE) was performed utilizing the previously determined processing conditions. The molded parts were measured using an optical coordinate measuring machine (OCMM), which had previously been examined with a repeatability and reproducibility (R & R) study. These measurements were analyzed to determine the processing parameters that had the greatest effect on the shrinkage and warpage (S&W). The results of this analysis indicated that the supercritical fluid content and core-to-skin volume ratio had the greatest effect on the shrinkage and warpage of microcellular co-injection molded parts. The results of the experiment were that a considerable reduction in shrinkage and warpage could be achieved by utilizing microcellular co-injection molding. DOI : 10.3139/217.0122 En ligne : https://drive.google.com/file/d/14RkrG4PjPANl2LREyHsPkrNQnG-o1hhG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2817 [article]

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