聚酰胺类热塑性弹性体含量对PLLA／三元聚酰胺共混物形态和性能的影响  

Effect of Thermoplastic Polyamide Elastomer on Morphology and Properties of PLLA/Ternary Polyamide Blends

作　　者：江水青[1] 王如寅[2] 李海玲[1] 张勇[2] 

机构地区：[1]青岛大学高等职业技术学院高分子系,山东青岛266061 [2]上海交通大学高分子研究所,上海200240

出　　处：《中国塑料》2009年第3期41-45,共5页China Plastics

基　　金：山东省高等学校优秀青年教师国内访问学者项目[鲁教人函(2007)11号]

摘　　要：以聚酰胺类热塑性弹性体(TPAE)为增容剂增容左旋聚乳酸(PLLA)与三元聚酰胺共混物,采用扫描电子显微镜(SEM)、差热扫描量热仪(DSC)、X射线衍射仪(XRD)等研究了TPAE含量对PLLA/三元聚酰胺(70/30,质量比,下同)共混物的形态、力学性能和热性能的影响。力学性能研究结果表明,添加TPAE后,PLLA/三元聚酰胺共混物的拉伸强度、断裂伸长率、缺口冲击强度显著提高,TPAE含量为5份时,共混物的断裂伸长率为370%,缺口冲击强度为90J/m,拉伸强度为39MPa;SEM分析表明,添加TPAE后,共混物中三元聚酰胺相的粒径显著变小;DSC与XRD分析结果表明,TPAE含量对PLLA/三元聚酰胺共混物的熔融行为和结晶行为无明显影响,而共混物拉伸后,其结晶度显著提高。In this study, the effect of TPAE contents on the morphology, mechanical, and thermal properties of PLLA/ternary polyamide blends were investigated using SEM, DSC, and XRD. The tensile strength, elongation at break and impact strength of PLLA/ternary polyamide blends significantly increased after the addition of TPAE. When the mass ratio of PLLA/ternary polyamide/TPAE was 70/30/5, the blend gave the highest elongation at the break of 370 % and Izod impact strength of 90 J/m. SEM analysis showed that the domain size of ternary polyamide significantly decreased after the addition of TPAE. DSC and XRD analysis showed that the crystallinity of the blends significantly increased after tensile testing.

关 键 词：左旋聚乳酸 三元聚酰胺 聚酰胺类热塑性弹性体 共混物 性能 

分 类 号：TQ334[化学工程—橡胶工业]