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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; Zhang, QH (reprint author), Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.
2015
Source PublicationEUROPEAN POLYMER JOURNAL
ISSN0014-3057
Volume67Pages:88—98
Subtype期刊文献
AbstractA 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.
KeywordPerformance Copolyimide Fibers Regenerated Cellulose Fibers Rigid-rod Polymers Molecular Packing 3 Crystal-structure 3' Deformation 4 Evolution 4'-biphenyltetracarboxylic Dianhydride
Indexed BySCI
Language英语
WOS IDWOS:000357750900010
Citation statistics
Cited Times:28[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24919
Collection中科院上海应用物理研究所2011-2018年
Corresponding AuthorZhang, QH (reprint author), Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.
Recommended Citation
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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