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; Zhang, QH (reprint author), Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.
2015
发表期刊POLYMER
ISSN0032-3861
卷号75页码:178—186
文章类型期刊文献
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.
关键词Performance Copolyimide Fibers Multiwalled Carbon Nanotubes X-ray-diffraction In-situ Mechanical-properties Crystal-structure Molecular Mobility 3 P-phenylenediamine 3' Structural-changes 4 4'-biphenyltetracarboxylic Dianhydride
语种英语
WOS记录号WOS:000361879300022
引用统计
被引频次:17[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/25047
专题中科院上海应用物理研究所2011-2018年
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.
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.
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