Enhanced mechanical and hydrophobic properties of polyimide fibers containing benzimidazole and benzoxazole units
Yin, CQ; Dong, J; Zhang, DB; Lin, JY; 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EUROPEAN POLYMER JOURNAL
ISSN0014-3057
卷号67页码:88—98
文章类型期刊文献
摘要A series of rigid-rod co-polyimides (co-PI) containing benzimidazole and benzoxazole moieties were synthesized by the reaction of 2-(4-aminophenyl)-5-aminobenzimidazole (BIA) and 5-amino-2-(4-aminobenzene)benzoxazole (BOA) with 3,3',4,4'-biphenyltetracar-boxylic dianhydride (BPDA). The corresponding co-PI fibers with various diamine ratios were prepared by the two-step wet-spinning process. The small chemical structure difference between benzimidazole and benzoxazole moieties leads to unexpected great changes on the aggregation structures and properties of the obtained fibers. The two-dimensional wide-angle X-ray diffraction (WAXD) spectra imply that the co-PI fibers containing more than 70% molar ratio of BIA show better-defined ordered crystal structures, while for those samples with more BOA contents, a new ordered lateral packing occurs. Meanwhile, the equatorial scattering streaks in the small-angle X-ray scattering (SAXS) patterns for the co-PI fibers suggest the presence of microvoids, whose sizes were evaluated by means of Guinier and Ruland's method. The optimum tensile strength and modulus of co-PI fibers are as high as 1.74 and 74.4 GPa, respectively, at the BIA/BOA molar ratio of 7/3. Besides, the co-PI fibers exhibit excellent thermal and thermo-oxidative stabilities due to the rigid molecular chains. The introduction of BOA units in the polymer backbones have apparently improved the hydrophobic properties of PI fibers. (C) 2015 Elsevier Ltd. All rights reserved.
关键词Performance Copolyimide Fibers Regenerated Cellulose Fibers Rigid-rod Polymers Molecular Packing 3 Crystal-structure 3' Deformation 4 Evolution 4'-biphenyltetracarboxylic Dianhydride
收录类别SCI
语种英语
WOS记录号WOS:000357750900010
引用统计
被引频次:23[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/331007/24919
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,Zhang, DB,et al. Enhanced mechanical and hydrophobic properties of polyimide fibers containing benzimidazole and benzoxazole units[J]. EUROPEAN POLYMER JOURNAL,2015,67:88—98.
APA Yin, CQ,Dong, J,Zhang, DB,Lin, JY,Zhang, QH,&Zhang, QH .(2015).Enhanced mechanical and hydrophobic properties of polyimide fibers containing benzimidazole and benzoxazole units.EUROPEAN POLYMER JOURNAL,67,88—98.
MLA Yin, CQ,et al."Enhanced mechanical and hydrophobic properties of polyimide fibers containing benzimidazole and benzoxazole units".EUROPEAN POLYMER JOURNAL 67(2015):88—98.
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