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	Coupling effects of spinodal decomposition and crystallization on mechanical properties of polyolefin blends
	Yang, Liang1,2; Niu, Yanhua1; Wang, Howard3; Wang, Zhigang1
刊名	Polymer
	2009-01-16
卷号	50期号:2页码:627-635
关键词	Polyethylene blends Liquid-liquid phase separation Tensile properties
ISSN号	0032-3861
DOI	10.1016/j.polymer.2008.11.033
通讯作者	Wang, zhigang(zgwang@iccas.ac.cn)
英文摘要	The 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.
WOS关键词	PHASE-SEPARATION KINETICS ; STRESS-STRAIN CURVES ; X-RAY-SCATTERING ; POLYETHYLENE COPOLYMERS ; TENSILE PROPERTIES ; MOLECULAR-WEIGHT ; POLYMER BLENDS ; YIELD-STRESS ; MODEL ; MORPHOLOGY
WOS研究方向	Polymer Science
WOS类目	Polymer Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000262592400037
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2405287
专题	中国科学院大学
通讯作者	Wang, Zhigang
作者单位	1.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
推荐引用方式 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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