CRYSTALLIZATION SEGREGATION DSC STUDIES OF PP/PE COPOLYMERS  

作　　者：Yu Ma Ying Wang Shan-nong Zhu Mao Xu 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Center for Molecular Science Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080,China

出　　处：《Chinese Journal of Polymer Science》2001年第1期93-96,共4页高分子科学(英文版)

摘　　要：The structural analysis of two PP/PE copolymer samples,1 and 2,was conducted by using^(13)C-NMR,GPC and crystallization segregation DSC(CSDSC)techniques.A pure polypropylene sample was also used for comparison.It was found that the two copolymer samples are very close in composition(the ethylene mol content is 4.3%and 4.5%,respectively),stereoregularity(96%and 97%)and molecular weight(M_(w)=7.0 x 10^(4)and 7.3 x 10^(4);M-(w)/M_(n)=5.0 and 6.1,respectively).While the CSDSC thermograms of the two samples are quite different from each other.Sample 1 shows a higher average melting temperature and a broader distribution of its thermogram These phenomena were explained as an indication of a less uniform distribution of ethylene units along the PP chains for sample 1.It was noted that CSDSC is a very sensitive and convenient technique for structural studies of copolymers.

关 键 词：PP/PE copolymer sequence distribution crystallization segregation DSC ^(13)C-NMR 

分 类 号：O63[理学—高分子化学]