Shear Induced Phase Boundary Shift in the Critical and Off-Critical Regions for a Polybutadiene/Polyisoprene Blend

doi:10.1021/ma2021562

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	Shear Induced Phase Boundary Shift in the Critical and Off-Critical Regions for a Polybutadiene/Polyisoprene Blend
	Zou, Fasheng 1,2; Dong, Xia 1,2; Liu, Wei 1,2; Yang, Jian 1,2; Lin, Demiao 1,2; Liang, Aimin 3; Li, Wei 3; Han, Charles C.1,2
刊名	MACROMOLECULES
	2012-02-14
卷号	45 期号:3 页码:1692-1700
ISSN号	0024-9297
DOI	10.1021/ma2021562
英文摘要	The rheology of near- and off-critical elastomeric blends of polybutadiene (PB)/ low vinyl content polyisoprene (LPI) has been studied as a function of temperature, heating rate, and shear frequency. Depending on the composition, near or far away from the critical point, blends showed different behaviors in several aspects: temperature ramp curves, shift of the apparent binodal and spinodal points under oscillatory shear at the given frequency and strain amplitude. The composition dependent rheological responses are interpreted by the differences in the amplitude of the critical fluctuation near the phase boundary and in the shear induced mixing mechanisms between near- and off-critical blends. For near-critical blends, the critical fluctuation is large enough to induce a considerable extra stress when the blend is still in the miscible state. As a result, a heating rate independent upturn of G' can be observed and the apparent spinodal point can be greatly shifted through the strong suppression of the large critical fluctuations. In contrast, for off-critical blends, the critical fluctuations in the metastable region are relatively small and there is competition between the phase separation kinetics and the heating rate. Therefore, the blend displayed a heating rate dependent apparent binodal point and a large shift of the apparent binodal point but a moderate shift of the spinodal point under oscillatory shear. By lowering or extrapolating the measured frequency to a very small value (0.1 rad/s in this study) for both binodal and spinodal points, the theologically determined phase diagram is consistent with the static results obtained by optical microscopy observations.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000300124200063
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/49719]
专题	中国科学院化学研究所
通讯作者	Dong, Xia
作者单位	1.Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China 2.Chinese Acad Sci, CAS Key Lab Engn Plast, Joint Lab Polymer Sci & Mat, Beijing Natl Lab Mol Sci,Inst Chem, Beijing 100190, Peoples R China 3.SINOPEC Beijing Res Inst Chem Ind, Yanshan Branch, Beijing 102500, Peoples R China
推荐引用方式 GB/T 7714	Zou, Fasheng,Dong, Xia,Liu, Wei,et al. Shear Induced Phase Boundary Shift in the Critical and Off-Critical Regions for a Polybutadiene/Polyisoprene Blend[J]. MACROMOLECULES,2012,45(3):1692-1700.
APA	Zou, Fasheng.,Dong, Xia.,Liu, Wei.,Yang, Jian.,Lin, Demiao.,...&Han, Charles C..(2012).Shear Induced Phase Boundary Shift in the Critical and Off-Critical Regions for a Polybutadiene/Polyisoprene Blend.MACROMOLECULES,45(3),1692-1700.
MLA	Zou, Fasheng,et al."Shear Induced Phase Boundary Shift in the Critical and Off-Critical Regions for a Polybutadiene/Polyisoprene Blend".MACROMOLECULES 45.3(2012):1692-1700.