Microcellular injection-molding of polylactide with chain-extender

被引：98

作者：

Pilla, Srikanth ^{[1
]}

Kramschuster, Adam ^{[3
]}

Yang, Liqiang ^{[1
]}

Lee, Junghoo ^{[3
]}

Gong, Shaoqin ^{[1
,2
]}

Turng, Lih-Sheng ^{[3
]}

机构：

[1] Univ Wisconsin, Dept Mech Engn, Milwaukee, WI 53201 USA

[2] Univ Wisconsin, Dept Mat, Milwaukee, WI 53201 USA

[3] Univ Wisconsin, Ctr Polymer Engn, Dept Mech Engn, Madison, WI 53706 USA

来源：

MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS | 2009年 / 29卷 / 04期

关键词：

Polylactide; Chain-extender; Biodegradable; Microcellular; Injection-molding; GUIDED TISSUE REGENERATION; MECHANICAL-PROPERTIES; POLY(L-LACTIC ACID); BARRIER PROPERTIES; POLYSTYRENE MELTS; POLY(LACTIC ACID); GLASS-TRANSITION; POLYESTERS PET; DISSOLVED-GAS; BEHAVIOR;

D O I：

10.1016/j.msec.2008.10.027

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of adding an epoxy-based chain-extender (CE) on the properties of injection-molded solid and microcellular polylactide (PLA) were studied. PLA and PLA with 8 wt.% CE (PLA-CE) were melt-compounded using a twin-screw extruder. Solid and microcellular specimens were produced via a conventional and microcellular injection-molding process, respectively. Various characterization techniques including gel permeation chromatography, tensile testing and dynamic mechanical analysis, scanning electron microscopy and differential scanning calorimetry were applied to study the molecular weight, static and dynamic mechanical properties, cell morphology, and crystallization behavior, respectively. The addition of CE enhanced the molecular weight but decreased the crystallinity of PLA. The addition of CE also reduced the cell size and increased the cell density. Furthermore, the decomposition temperatures and several tensile properties, including specific strength, specific toughness, and strain-at-break of both solid and microcellular PLA specimens, increased with the addition of CE. (C) 2008 Elsevier B.V. All rights reserved

引用

页码：1258 / 1265

页数：8

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