Crystallization segregation DSC studies of PP/PE copolymers
Ma, Y; Wang, Y; Zhu, SN; Xu, M
AbstractThe structural analysis of two PP/PE copolymer samples, 1 and 2, was conducted by using C-13-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.
KeywordPp/pe Copolymer Sequence Distribution Crystallization Segregation Dsc C-13-nmr
Indexed BySCI
WOS IDWOS:000166329700016
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Document Type期刊论文
Corresponding AuthorXu, M
AffiliationChinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Ma, Y,Wang, Y,Zhu, SN,et al. Crystallization segregation DSC studies of PP/PE copolymers[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2001,19(1):93-96.
APA Ma, Y,Wang, Y,Zhu, SN,&Xu, M.(2001).Crystallization segregation DSC studies of PP/PE copolymers.CHINESE JOURNAL OF POLYMER SCIENCE,19(1),93-96.
MLA Ma, Y,et al."Crystallization segregation DSC studies of PP/PE copolymers".CHINESE JOURNAL OF POLYMER SCIENCE 19.1(2001):93-96.
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