Strain-induced crystallization of polyimide fibers containing 2-(4-aminophenyl)-5-aminobenzimidazole moiety

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	Strain-induced crystallization of polyimide fibers containing 2-(4-aminophenyl)-5-aminobenzimidazole moiety
	Yin, CQ; Dong, J; Tan, WJ; Lin, JY; Chen, DJ; Zhang, QH
刊名	POLYMER
	2015
卷号	75 页码:178—186
关键词	PERFORMANCE COPOLYIMIDE FIBERS MULTIWALLED CARBON NANOTUBES X-RAY-DIFFRACTION IN-SITU MECHANICAL-PROPERTIES CRYSTAL-STRUCTURE 3 MOLECULAR MOBILITY P-PHENYLENEDIAMINE STRUCTURAL-CHANGES 3' 4 4'-BIPHENYLTETRACARBOXYLIC DIANHYDRIDE
ISSN号	0032-3861
通讯作者	Zhang, QH (reprint author), Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.
英文摘要	Structural evolution induced by cyclization reaction and heat-drawing of polyimide (PI) fibers containing the 2-(4-aminophenyl)-5-aminobenzimidazole moiety was studied by means of synchrotron radiation wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). WAXD results indicate that the drawing process induces an increase in the crystallinity and crystal orientation of PI fibers, leading to improvement of the mechanical properties. SAXS results reveal that lamellar structures formed upon heat-drawing. A mechanism for strain-induced phase transitions has been proposed to correlate the structural information with WAXD/SAXS patterns. Dynamic mechanical analysis (DMA) of the obtained fibers shows an obvious a relaxation process above room temperature, which is found to be crystallinity dependent, the intensity of tan d decreases significantly after heat-drawing. The stretched fiber exhibits a negative value of the linear coefficient of thermal expansion (CTE), while the unstretched PI fiber exhibits a positive value. Moreover, heat-drawing increases the thermal stability of the prepared fibers. These improvements may be related to the aggregation structure of the high performance fibers. (C) 2015 Elsevier Ltd. All rights reserved.
语种	英语
WOS记录号	WOS:000361879300022
公开日期	2016-03-08
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/25047]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Yin, CQ,Dong, J,Tan, WJ,et al. Strain-induced crystallization of polyimide fibers containing 2-(4-aminophenyl)-5-aminobenzimidazole moiety[J]. POLYMER,2015,75:178—186.
APA	Yin, CQ,Dong, J,Tan, WJ,Lin, JY,Chen, DJ,&Zhang, QH.(2015).Strain-induced crystallization of polyimide fibers containing 2-(4-aminophenyl)-5-aminobenzimidazole moiety.POLYMER,75,178—186.
MLA	Yin, CQ,et al."Strain-induced crystallization of polyimide fibers containing 2-(4-aminophenyl)-5-aminobenzimidazole moiety".POLYMER 75(2015):178—186.