ICCAS OpenIR
Shear-induced crystallization in a blend of isotactic polypropylene and high density polyethylene
Wang, Yan2; Meng, Kun1; Hong, Song1; Xie, Xuming2; Zhang, Chenggui1; Han, Charles C.1,2
2009-01-16
Source PublicationPOLYMER
ISSN0032-3861
Volume50Issue:2Pages:636-644
AbstractShish-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.
KeywordBlend Shear Crystallization
DOI10.1016/j.polymer.2008.11.041
Indexed BySCI
Language英语
WOS IDWOS:000262592400038
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/67802
Collection中国科学院化学研究所
Corresponding AuthorMeng, Kun
Affiliation1.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
Recommended Citation
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.
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