Temperature dependence of chain conformation and local rigidity of isomerized polyimides in dimethyl formamide

doi:10.1007/s40242-013-2323-4

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	Temperature dependence of chain conformation and local rigidity of isomerized polyimides in dimethyl formamide
	Liu Gui-hua 1; Qiu Xue-peng 2; Siddiq, Mohammad 3; Bo Shu-qin 1; Ji Xiang-ling 1
刊名	CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
	2013-10-01
卷号	29 期号:5 页码:1022-1028
关键词	Isomerized Polyimide Chain Conformation Temperature Dependence Wormlike Chain Persistence Length
ISSN号	1005-9040
DOI	10.1007/s40242-013-2323-4
英文摘要	Temperature dependence of chain conformation and local rigidity of two soluble isomerized polyimides (PIs), poly(hexafluorodianhydride/3,3'-dimethylbenzidine)[poly(6FDA/3,3'-DMB)] and poly(hexafluorodianhy-dride/2,2'-dimethylbenzidine)[poly(6FDA/2,2'-DMB)] were investigated by dilute solution viscosity, size exclusion chromatography(SEC) coupled with multi-angle laser light scattering, viscometer, and refractive index detector in dimethylformamide(DMF) with either 0.1 mol/L LiBr or 3.1 mmol/L tetrabutylammonium bromide(TBAB) in the temperature range of 30 to 50 A degrees C. The scaling relationships of [eta]=K (eta) M (alpha) and R (g)=K (g) M (nu) obtained are employed to investigate the temperature dependence of chain conformation for the two polyimides. The values of alpha and nu are in the range of 0.66-0.69 and 0.53-0.56, respectively, for poly(6FDA/3,3'-DMB), meanwhile they are in the range of 0.64-0.68 and 0.53-0.56, respectively, for poly(6FDA/2,2'-DMB). These results reveal that random coil conformations for both PIs are not affected visibly with increasing temperature from 30 A degrees C to 50 A degrees C. However, values of more exact intrinsic viscosity from dilute solution measurement indicate there is only tiny coil extension or shrinkage for both PIs with temperature rising. Parameters related to chain flexibility of polymer, including persistence length l (p), shift factor M (L) (relative molecular weight per unit contour length) and backbone diameter d are estimated from the relationship between intrinsic viscosity and molecular weight for the continuous wormlike cylinder model, which indicates that two samples are flexible chains, only the chain of poly(6FDA/3,3'-DMB) is stiffer than that of poly(6FDA/2,2'-DMB) slightly.
语种	英语
出版者	HIGHER EDUCATION PRESS
WOS记录号	WOS:000325359400038
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/54953]
专题	中国科学院化学研究所
通讯作者	Bo Shu-qin
作者单位	1.Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Chinese Acad Sci, Polymer Composites & Engn Lab, Changchun Inst Appl Chem, Changchun 130022, Peoples R China 3.Quaid I Azam Univ, Dept Chem, Islamabad 45320, Pakistan
推荐引用方式 GB/T 7714	Liu Gui-hua,Qiu Xue-peng,Siddiq, Mohammad,et al. Temperature dependence of chain conformation and local rigidity of isomerized polyimides in dimethyl formamide[J]. CHEMICAL RESEARCH IN CHINESE UNIVERSITIES,2013,29(5):1022-1028.
APA	Liu Gui-hua,Qiu Xue-peng,Siddiq, Mohammad,Bo Shu-qin,&Ji Xiang-ling.(2013).Temperature dependence of chain conformation and local rigidity of isomerized polyimides in dimethyl formamide.CHEMICAL RESEARCH IN CHINESE UNIVERSITIES,29(5),1022-1028.
MLA	Liu Gui-hua,et al."Temperature dependence of chain conformation and local rigidity of isomerized polyimides in dimethyl formamide".CHEMICAL RESEARCH IN CHINESE UNIVERSITIES 29.5(2013):1022-1028.