ICCAS OpenIR
Effect of crystallization temperature and propylene sequence length on the crystalline structure of propylene-ethylene random copolymers
Gou QingQiang1,2; Li HuiHui1,2; Yu ZhenQiang3; Chen ErQiang3; Zhang YuDong4; Yan ShouKe1,2
2008-06-01
Source PublicationCHINESE SCIENCE BULLETIN
ISSN1001-6538
Volume53Issue:12Pages:1804-1812
AbstractCrystallization behavior and resultant crystalline structure of a series of temperature-rising elution-fractionated specimen of a Ziegler-Natta catalyst-synthesized propylene-ethylene random copolymer were studied by DSC, WAXD and AFM. The experimental results indicate that both crystallization temperature and propylene sequence length exhibit great influence on the crystallization behavior and crystalline structure of the copolymer. It was found that the ethylene co-monomers acting as point defects inserted into the polypropylene chains play an important role in the formation of gamma-iPP. As the co-monomer content increases, the crystallizable sequence length of iPP decreases, which produces an appropriate condition for its gamma crystallization. At the same time, the existence of chain defects leads to a lower crystallinity of the copolymer and imperfection of the resultant crystals. For each individual sample with certain propylene sequence length or ethylene content, the increment of gamma-iPP crystal content with increasing crystallization temperature demonstrates that higher crystallization temperature is in favor of the gamma-iPP crystallization. Pure gamma-iPP crystals have been got in samples with propylene sequence length lower than 21 under suitable crystallization conditions.
KeywordPropylene-ethylene Random Copolymer Crystallization Dsc Waxd Afm
DOI10.1007/s11434-008-0252-2
Indexed BySCI
Language英语
WOS IDWOS:000256963000005
PublisherSCIENCE PRESS
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/63766
Collection中国科学院化学研究所
Corresponding AuthorYan ShouKe
Affiliation1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China
3.Peking Univ, Dept Polymer Sci, Sch Chem, Beijing 100871, Peoples R China
4.SINOPEC, Beijing Res Inst Chem Ind, Beijing 100013, Peoples R China
Recommended Citation
GB/T 7714
Gou QingQiang,Li HuiHui,Yu ZhenQiang,et al. Effect of crystallization temperature and propylene sequence length on the crystalline structure of propylene-ethylene random copolymers[J]. CHINESE SCIENCE BULLETIN,2008,53(12):1804-1812.
APA Gou QingQiang,Li HuiHui,Yu ZhenQiang,Chen ErQiang,Zhang YuDong,&Yan ShouKe.(2008).Effect of crystallization temperature and propylene sequence length on the crystalline structure of propylene-ethylene random copolymers.CHINESE SCIENCE BULLETIN,53(12),1804-1812.
MLA Gou QingQiang,et al."Effect of crystallization temperature and propylene sequence length on the crystalline structure of propylene-ethylene random copolymers".CHINESE SCIENCE BULLETIN 53.12(2008):1804-1812.
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