EVA增容原位微纤化PET/PE合金的研究  

Poly(ethylene terephthalate)/Polyethylene in-situ Microfiber-Containing Alloy Compatibilized by Ethylene Vinyl Acetate Copolymer

作　　者：李忠明[1] 杨鸣波[1] 黄锐[1] 

机构地区：[1]四川大学高分子科学与工程学院高分子材料工程国家重点实验室

出　　处：《西北工业大学学报》2004年第1期124-128,共5页Journal of Northwestern Polytechnical University

基　　金：国家自然科学基金 (5 0 10 30 0 7);中国工程物理研究院基金资助

摘　　要：采用“熔融挤出 -热拉伸 -淬冷”方法制备了原位微纤化聚对苯二甲酸乙二醇酯 ( PET) /聚乙烯 ( PE)合金 ,用乙烯 -醋酸乙烯酯共聚物 ( EVA)改善原位微纤化合金界面。扫描电子显微镜 ( SEM)照片表明 ,微纤化合金含有良好的纤维结构。未增容原位微纤化合金界面光滑 ,纤维与基体界面作用弱 ,EVA增容后 ,界面得到改善。增容和未增容试样拉伸性能比较发现 ,前者较后者的断裂强度 ,特别是断裂伸长率 ,有显著提高 ,但屈服强度和模量有所下降。采用比基本断裂功 ( specific essen-tial work of fracture,we)评价了 EVA的增容效果 ,发现加入少量增容剂和催化剂后 ,原位微纤化合金的 we较未增容试样显著增加 ,证明了Our four previous papers, Refs. 5,6,7, and 8 were all published in 2002. These papers dealt with PET/PE in situ microfiber containing polymer alloy, where PET denotes poly(ethylene terephthalate) and PE denotes polyethylene. Thinking over these four papers, we came to believe that PET/PE microfiber alloy′s interface can be improved through compatibilization. In this paper we prepared PET/PE in situ microfiber containing polymer alloy by melt extrusion hot stretching quenching process and compatibilized it with EVA(ethylene vinyl acetate copolymer). PE, PET, EVA and DBTO (dibutyltin preoxide) used in our experiments were products made in P.R.C., Japan, France, and South Korea respectively. The morphology of the alloy shows that the well defined microfibers with several microns in diameter were generated in situ. The uncompatibilized PET/PE microfibrillar alloy has clear interfaces and poor interaction, whereas the compatibilized one has greatly improved interfaces. Comparison of the tensile properties between the neat and the compatibilized alloys indicates that the compatibilized alloy has higher tensile strength at break and especially ultimate elongation, while yield strength and tensile modulus are lower than those of the neat microfibrillar alloy. The specific essential work of fracture ( w e ) was used to characterize the fracture toughness of the microfibrillar alloy. It is found that the w e can be increased as EVA content rises, which indicates indirectly the high interfacial interaction in the compatibilized alloy. When using DBTO as the catalyst of the transesterification reaction between PET and EVA, the w e can be increased from 64.27 to 128.67 kJ/cm 2.

关 键 词：聚对苯二甲酸乙二醇酯/聚乙烯原位复合材料 乙烯-醋酸乙烯酯共聚物 增容 比基本断裂功 原位微纤化合金 拉伸性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] TQ316.6