Shear-induced crystallization in a blend of isotactic polypropylene and high density polyethylene

doi:10.1016/j.polymer.2008.11.041

CORC > 化学研究所 > 中国科学院化学研究所

	Shear-induced crystallization in a blend of isotactic polypropylene and high density polyethylene
	Wang, Yan 2; Meng, Kun 1; Hong, Song 1; Xie, Xuming 2; Zhang, Chenggui 1; Han, Charles C.1,2
刊名	POLYMER
	2009-01-16
卷号	50 期号:2 页码:636-644
关键词	Blend Shear Crystallization
ISSN号	0032-3861
DOI	10.1016/j.polymer.2008.11.041
英文摘要	Shish-kebab morphologies were observed with relatively low shear rate and low temperature in the phase-separated isotactic polypropylene (iPP) and high density polyethylene (HDPE) blend. Both components are crystallizable polymers. In our experiments, relatively low shear rates and low temperatures were used, so that the entangled network chains cannot be broken up or disentangled, and the shish nuclei must be formed from oriented and stretched network chains instead of a bundle of pulled-out chains. The effects of shear rate, shear time and temperature on the formation and morphology of shish-kebabs were studied by in situ optical microscopy and shear hot stage under various thermal and shear histories. Optical microscopic measurement showed that the length of iPP cylindrites is much longer than the dimension of phase domains, which implies that iPP cylindrites grow through both iPP and HDPE phase domains. An unexpected 'core-shell' structure was observed in the melting procedure, which could be explained by the difference of crystallinity between 'core' and 'shell'. It is most important that two kinds of shish-kebabs, the interface morphology and transcrystallites were observed by scanning electron microscopy (SEM). SEM observation also revealed that the width of iPP shish is about 1-2 mu m and the width of HDPE shish is about 100 nm. The difference in the shish width probably resulted from the lower molecular weight, higher polydispersity, less inter-chain interaction force, and faster nucleation and growth rate of HDPE relative to the iPP chains. (C) 2008 Elsevier Ltd. All rights reserved.
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000262592400038
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/67801]
专题	中国科学院化学研究所
通讯作者	Meng, Kun
作者单位	1.Chinese Acad Sci, Inst Chem, Joint Lab Polymer Sci & Mat, Beijing Natl Lab Mol Sci,State Key Lab Polymer Ph, Beijing 100190, Peoples R China 2.Tsinghua Univ, Dept Chem Engn, Inst Polymer Sci & Engn, Adv Mat Lab, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yan,Meng, Kun,Hong, Song,et al. Shear-induced crystallization in a blend of isotactic polypropylene and high density polyethylene[J]. POLYMER,2009,50(2):636-644.
APA	Wang, Yan,Meng, Kun,Hong, Song,Xie, Xuming,Zhang, Chenggui,&Han, Charles C..(2009).Shear-induced crystallization in a blend of isotactic polypropylene and high density polyethylene.POLYMER,50(2),636-644.
MLA	Wang, Yan,et al."Shear-induced crystallization in a blend of isotactic polypropylene and high density polyethylene".POLYMER 50.2(2009):636-644.