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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Microcellular injection molding / S. Gong in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 2 (06/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 2 (06/2005) . - p. 202-214 Titre : Microcellular injection molding Type de document : texte imprimé Auteurs : S. Gong, Auteur ; Lih-Sheng Turng, Auteur ; A. Osorio, Auteur ; H. Kharbas, Auteur ; A. Chandra, Auteur ; M. Yuan, Auteur Année de publication : 2005 Article en page(s) : p. 202-214 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This paper reviews some of the recent developments of microcellular injection molding, which is capable of producing parts with excellent dimensional stability using lower injection pressure, shorter cycle time, and less material. Process conditions as well as nano/micro-fillers such as nanoclay and core–shell rubber have a strong influence on cell density and cell size, hence, the final material properties of the molded parts. The addition of nano/micro-fillers at optimum loading levels can generally facilitate the formation of microcellular plastics with higher cell density and smaller cell size leading to superior mechanical properties. The novel integration of a solid plastic surface with a microcellular plastic core via the co-injection molding technique has been investigated to achieve Class “A” surfaces and improved material performance. An improved mathematical model has been developed to simulate the cell growth behavior in the microcellular injection molding process. DOI : 10.3139/217.1883 En ligne : https://drive.google.com/file/d/1tNvJwDvWFCky3KsVs2MkLFhq5fYBNXwz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3081 [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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