Study on the beta relaxation mechanism of thermosetting polyimide thermoplastic polyimide blends

	Study on the beta relaxation mechanism of thermosetting polyimide thermoplastic polyimide blends
	Tang H ; Dong LS ; Zhang J ; Ding MX ; Feng ZL
刊名	european polymer journal
	1996
卷号	32 期号:10 页码:1221-1227
ISSN号	0014-3057
通讯作者	tang h
中文摘要	the thermosetting polyimide pmr-i5 and its blends with thermoplastic polyimides have been studied by dynamic mechanical analysis. the results obtained indicate that the level of beta relaxations in pmr-15 are increased with an increase in cross-linking density. this phenomenon is interpreted as a change of chemical structure during the cross-linking process. addition of thermoplastic polyimide makes the magnitude of beta relaxations increase when pmr-15 is the major component. this might be due to the strong intermolecular charge-transfer interaction between pi and pi or pmr-15 and pmr-15 molecular chains being partly replaced by the weak intermolecular interaction between pi and pmr-15 in pmr-15/pi blends, resulting in some phenylene rings or imide groups in pis and pmr-15 chains being able to participate in beta relaxation. however, this increment in beta relaxation magnitude can be reduced by heat treatment of the sample, as a result of phase separation. hence, it is concluded that the beta relaxation magnitude is determined by the number of groups which can participate in relaxation per unit length, i.e. the magnitude of beta relaxation increases with decreasing interaction between the molecular chains. copyright (c) 1996 elsevier science ltd
收录类别	SCI收录期刊论文
语种	英语
公开日期	2010-12-22 ; 2011-06-09
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/25165]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Tang H,Dong LS,Zhang J,et al. Study on the beta relaxation mechanism of thermosetting polyimide thermoplastic polyimide blends[J]. european polymer journal,1996,32(10):1221-1227.
APA	Tang H,Dong LS,Zhang J,Ding MX,&Feng ZL.(1996).Study on the beta relaxation mechanism of thermosetting polyimide thermoplastic polyimide blends.european polymer journal,32(10),1221-1227.
MLA	Tang H,et al."Study on the beta relaxation mechanism of thermosetting polyimide thermoplastic polyimide blends".european polymer journal 32.10(1996):1221-1227.