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首页> 外文期刊>Journal of Applied Polymer Science >High-performance copoly(benzimidazole-benzoxazole-imide) fibers: Fabrication, structure, and properties
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High-performance copoly(benzimidazole-benzoxazole-imide) fibers: Fabrication, structure, and properties

机译：高性能共聚（苯并咪唑-苯并恶唑-酰亚胺）纤维：制造，结构和性能

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摘要

Novel high-performance copolyimide (co-PI) fibers containing benzimidazole and benzoxazole ring in the main chain were prepared by a two-step spinning via the poly(amic acid)s. Effects of the incorporated benzimidazole and benzoxazole units on the micro-structure and properties of co-PI fibers were investigated. Fourier transform infrared (FTIR) results indicated that hydrogen bonding is formed in the co-PI fibers. The co-PI fibers exhibited discernible crystallization peaks at 14 degrees approximate to 15 degrees and 23 degrees approximate to 26 degrees (2), showing crystalline-like structure. Moreover, the packing type of benzimidazole-imide units determined the macromolecules packing of co-PIs. It was amazedly found that the co-PI fibers exhibited higher tensile strength and initial modulus than those of corresponding homo-PI fibers, reaching tensile strength of 2.2-2.6 GPa, initial modulus of 99.1-113.2 GPa. The results of dynamic mechanical analysis (DMA) indicated co-PI2 fiber had a positive T-g deviation due to the presence of strong intermolecular hydrogen bonding between benzimidazole-imide and benzoxazole-imide units, which maybe lead to the effective stress transfer between benzimidazole-imide units and benzoxazole-imide units. In addition, the obtained PI fibers exhibited excellent thermal properties with the 10% weight loss temperatures under N-2 in the range of 574-585 degrees C. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42001.
机译：通过经由聚酰胺酸的两步纺丝，制备了在主链中包含苯并咪唑和苯并恶唑环的新型高性能共聚酰亚胺（co-PI）纤维。研究了掺入的苯并咪唑和苯并恶唑单元对共PI纤维的微观结构和性能的影响。傅里叶变换红外光谱（FTIR）结果表明，co-PI纤维中形成了氢键。 co-PI纤维在14度（约15度）和23度（约26度）处显示出可识别的结晶峰（2），显示出晶体状结构。此外，苯并咪唑-酰亚胺单元的堆积类型决定了co-PIs的大分子堆积。令人惊讶地发现，co-PI纤维显示出比相应的均质-PI纤维更高的拉伸强度和初始模量，达到2.2-2.6GPa的拉伸强度，99.1-113.2GPa的初始模量。动态力学分析（DMA）结果表明，由于苯并咪唑-酰亚胺和苯并恶唑-酰亚胺单元之间存在强大的分子间氢键，co-PI2纤维具有正的Tg偏差，这可能导致苯并咪唑-酰亚胺之间的有效应力转移单元和苯并恶唑酰亚胺单元。另外，所获得的PI纤维在N-2下10％的失重温度在574-585℃的范围内表现出优异的热性能。（c）2015 Wiley Periodicals，Inc.J.Appl。 Polym。科学2015，132，42001。

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