Sub-Rouse Mode Relaxation in Ethylene-propylene-diene Rubber above Glass Transition

doi:10.11777/j.issn1000-3304.2016.15379

HFCAS OpenIR > 中科院固体物理研究所

	Sub-Rouse Mode Relaxation in Ethylene-propylene-diene Rubber above Glass Transition
	Cao, Hang 1,2; Gu, Zhen3 ; Chen, Zhao 2; Li, Shi-yuan 2; Zheng, Kang2 ; Qin, Yong 1; Tian, Xing-you2 ; Zhang, Xian2
	2016-09-20
发表期刊	ACTA POLYMERICA SINICA
摘要	The chain relaxation behavior of ethylene-propylene-diene rubber (EPDM) was investigated by dynamic mechanical analysis (DMA). The results indicated that there were three tan delta peaks for EPDM at low frequencies, which were attributed to glass transition (alpha transition), sub-Rouse mode (alpha' transition) and Rouse mode (alpha" transition), respectively. In addition, compared with the glass transiton, sub-Rouse mode has a much stronger frequency-dependence, showing that the sub-Rouse mode moves to high temperature faster than the a mode with the augment of frequency, which is sensible and consistent with the previous works as the local segmental motions are moreinter molecularly coupled than the sub-Rouse mode relaxation in polymers, such as PS, PVAc and PMMA. After comprehensive analyses of frequency-domain spectra of EPDM via figuring out the temperature dependence of relaxation time, relaxation strength, coupling parameter and shape parameter, a dynamic crossover at T-B 384 K was found in sub-Rouse (alpha') mode. What' s more, the crossover relaxation time T-alpha' (T-B) is calculated as 0. 11 s, approximately, which is remarkably close to that of PS, PVAc and PVAc/ PEO blends (10((-0.5 +/- 0.5))s), indicating that this crossover arises at a particular point of relaxation time. According to the coupling model, the crossover is suggested to be caused by the strong increase of intermolecular cooperativity below T-B.
文章类型	Article
关键词	Epdm Relaxatio'n Time Coupling Model Intermolecular Cooperativity
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.11777/j.issn1000-3304.2016.15379
关键词[WOS]	MECHANICAL SPECTROSCOPY ; POLYMERS ; DYNAMICS ; POLYISOBUTYLENE ; CROSSOVER ; LIQUIDS
收录类别	SCI
语种	英语
WOS研究方向	Polymer Science
WOS类目	Polymer Science
WOS记录号	WOS:000384870700006
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/30168
专题	中科院固体物理研究所
作者单位	1.Chinese Acad Sci, Inst Solid State Phys, Hefei 230031, Peoples R China 2.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Appl Technol, Hefei 230088, Peoples R China 3.Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Cao, Hang,Gu, Zhen,Chen, Zhao,et al. Sub-Rouse Mode Relaxation in Ethylene-propylene-diene Rubber above Glass Transition[J]. ACTA POLYMERICA SINICA,2016(9):1206-1211.
APA	Cao, Hang.,Gu, Zhen.,Chen, Zhao.,Li, Shi-yuan.,Zheng, Kang.,...&Zhang, Xian.(2016).Sub-Rouse Mode Relaxation in Ethylene-propylene-diene Rubber above Glass Transition.ACTA POLYMERICA SINICA(9),1206-1211.
MLA	Cao, Hang,et al."Sub-Rouse Mode Relaxation in Ethylene-propylene-diene Rubber above Glass Transition".ACTA POLYMERICA SINICA .9(2016):1206-1211.

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