聚丙烯／超高相对分子质量聚乙烯共混物的结晶动力学及发泡性能研究  

Crystallization Kinetics and Foaming Performance of PP/PE-UHMW Blends

作　　者：黄英珠[1] 信春玲[1] 付中玉[2] 何亚东[1] 

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]北京服装学院服装材料研究开发与评价北京市重点实验室,北京100029

出　　处：《中国塑料》2009年第2期54-60,共7页China Plastics

基　　金：天津市自然科学基金(08JCYBJC09800)资助;北京市服装材料研究所开发与评价重点实验室开放基金

摘　　要：采用差示扫描量热仪(DSC)对含有不同含量超高分子量聚乙烯(PE-UHMW)的聚丙烯进行测试和表征,采用Ozawa方法、莫志深方法和Kissinger方法分析了该体系的非等温结晶动力学。利用自行研制的超临界流体挤出发泡实验装置,对含有UHMWPE的PP进行了超临界二氧化碳挤出发泡实验研究。结果表明:含有PE-UHMW的PP在较高的温度下开始结晶,且由于超高分子量聚乙烯大分子链的存在,与聚丙烯分子链发生缠结,阻碍聚丙烯分子链排入晶格,降低了结晶速率,结晶温区拓宽,有利于聚丙烯挤出发泡成型;加入PE-UHMW后,PP的发泡效果明显改善,泡孔平均直径减小,泡孔尺寸分布更加均匀,PE-UHMW的含量为5份时,表观密度达到0.03 g/cm3。Differential scanning calorimeter was used to characterize the non-isothermal crystallization of polypropylene/ultra high molecular weight polyethylene （PP/PE-UHMW） blends, with the data analyzed with Ozawa,Mo Zhishen, and Kissinger methods. Extrusion foaming experiments on PP/PE-UHMW blends were carried out on a self-made super critical liquid foaming equipment. It showed that in presence of PE-UHMW, the crystallization rate decreased, and PP began to crystal- lize at a higher temperature with the addition of PE-UHMW. The existence of macromolecullar chain of PE-UHMW and entanglement with PP obstructed moleeullar chain of PP into the lattice, so the crystallization temperature increased and the crystallization temperature range broadened, which resulted in obvious improvement of foaming performance of PP. When the content of PE-UHMW was 5 phr, the obtained apparent density of the extrudate was 0. 03 g/cm^3.

关 键 词：聚丙烯 超高相对分子质量聚乙烯 结晶动力学 发泡性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]