ICCAS OpenIR
Coupling effects of spinodal decomposition and crystallization on mechanical properties of polyolefin blends
Yang, Liang1,2; Niu, Yanhua1; Wang, Howard3; Wang, Zhigang1
2009-01-16
Source PublicationPOLYMER
ISSN0032-3861
Volume50Issue:2Pages:627-635
AbstractThe influences of preferentially occurred liquid-liquid phase separation (LLPS) and following crystallization processes on the mechanical properties of statistical copolymer blends of poly(ethylene-co-hexene) (PEH) and poly(ethylene-co-butene) (PEB) have been investigated in detail through tensile deformation tests with a relatively high extension rate to avoid the effect of interfacial properties of the blends. Crystallinity and lamellar thickness of the samples are estimated by using the wide-angle X-ray diffraction and small-angle X-ray scattering techniques, respectively. The tensile modulus and yield stress are found to increase with LLPS time up to 6 h, but decrease afterwards, under the conditions of temperature of 120 degrees C and isothermal crystallization time of 10 min. It is considered that the instantaneous tensile properties are substantially largely affected by the much perfect lamellar structures formed during crystallization with a long time prior LLPS step. This finding is further experimentally substantiated by the scanning electron microscope observation. Whereas the strain-hardening modulus described by a simple neo-Hookean relation increases with LLPS time and reaches a plateau after 6 h, which can be accounted for by the cooperation effect between amorphous entanglement density, insensitive to LLPS time, and crystallinity redistribution. The similarity of the results observed on the blends experiencing the spinodal decomposition (SD) process supports that the redistribution of crystallizable components contributes to the tensile stress increase, which is primarily controlled by the development of LLPS process. This simple relationship gives us a new insight of what controls the mechanical properties of the phase separated polymer blends and of how we might be able to predict the mechanical properties of as yet unmixed polymer pairs. (C) 2008 Elsevier Ltd. All rights reserved.
KeywordPolyethylene Blends Liquid-liquid Phase Separation Tensile Properties
DOI10.1016/j.polymer.2008.11.033
Indexed BySCI
Language英语
WOS IDWOS:000262592400037
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/68640
Collection中国科学院化学研究所
Corresponding AuthorWang, Zhigang
Affiliation1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Engn Plast, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.SUNY Binghamton, Dept Mech Engn, Binghamton, NY 13902 USA
Recommended Citation
GB/T 7714
Yang, Liang,Niu, Yanhua,Wang, Howard,et al. Coupling effects of spinodal decomposition and crystallization on mechanical properties of polyolefin blends[J]. POLYMER,2009,50(2):627-635.
APA Yang, Liang,Niu, Yanhua,Wang, Howard,&Wang, Zhigang.(2009).Coupling effects of spinodal decomposition and crystallization on mechanical properties of polyolefin blends.POLYMER,50(2),627-635.
MLA Yang, Liang,et al."Coupling effects of spinodal decomposition and crystallization on mechanical properties of polyolefin blends".POLYMER 50.2(2009):627-635.
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