文献类型：期刊文献

英文题名：Improving foamability of polypropylene by grafting modification

作者：Liu, Chunsheng[1]; Wei, Dafu[1]; Zheng, Anna[1]; Li, Yong[2]; Xiao, Huining[2]

机构：[1]E China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]Univ New Brunswick, Dept Chem Engn, Fredericton, NB E3B 5A3, Canada

年份：2006

卷号：101

期号：6

起止页码：4114

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20063710105322);WOS:【SCI-EXPANDED(收录号:WOS:000239445500073)】；

语种：英文

外文关键词：polypropylene; foams; grafting modification; polyester

摘要：Polypropylene (PP) foam has been considered as a potential substitute for other thermoplastics foams in industrial applications. However, the key concern is the weak melt strength of PP, which leads to a high content of open-cell structure in PP foams; and, thus, unsatisfactory for a number of applications. In this work, PP was modified by grafting with unsaturated linear polyester (ULP) in a twin-screw extruder in attempt to improve the melt strength of PP. The grafting reaction on PP and the modified PP were characterized using FT-IR, DSC, and TGA. The improved foamability was verified by SEM observation. In addition, the rheological behavior of modified PP was investigated using a Hakke rheometer. The results indicated that the melt strength of grafted PP was significantly enhanced, facilitating the foam formation. (c) 2006 Wiley Periodicals, Inc.