Enhanced mechanical and hydrophobic properties of polyimide fibers containing benzimidazole and benzoxazole units

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	Enhanced mechanical and hydrophobic properties of polyimide fibers containing benzimidazole and benzoxazole units
	Yin, CQ; Dong, J; Zhang, DB; Lin, JY; Zhang, QH
刊名	EUROPEAN POLYMER JOURNAL
	2015
卷号	67 页码:88—98
关键词	PERFORMANCE COPOLYIMIDE FIBERS REGENERATED CELLULOSE FIBERS RIGID-ROD POLYMERS 3 MOLECULAR PACKING CRYSTAL-STRUCTURE DEFORMATION EVOLUTION 3' 4 4'-BIPHENYLTETRACARBOXYLIC DIANHYDRIDE
ISSN号	0014-3057
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	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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000357750900010
公开日期	2016-03-08
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/24919]
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,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.(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.