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首页> 外文期刊>Journal of Applied Polymer Science >Polyimide fibers prepared by a dry-spinning process: Enhanced mechanical properties of fibers containing biphenyl units
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Polyimide fibers prepared by a dry-spinning process: Enhanced mechanical properties of fibers containing biphenyl units

机译：通过干纺工艺制备的聚酰亚胺纤维：含有联苯单元的纤维的机械性能增强

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摘要

Polyimide (PI) fibers with enhanced mechanical properties and high thermal and dimensional stability were prepared via a two-step dry-spinning process through the introduction of 3,3',4,4'-biphenyl tetracarboxylic dianhydride (BPDA) containing biphenyl units into rigid homopolyimide of pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline. The attenuated total reflectance-Fourier transform infrared spectra results imply that the incorporated BPDA moieties accelerate the imidization process and increase the imidization degree (ID) of the precursor fibers; this was attributed to the increased molecular mobility of the polymer chains. Two-dimensional wide-angle X-ray diffraction spectra indicated that the prepared PI fibers possessed a well-defined crystal structure and polymer chains in the crystalline region were highly oriented along the fiber axis. The PI fiber, with the molar ratio of PMDA/BPDA being 7/3, showed optimum tensile strength and modulus values of 8.55 and 73.21 cN/dtex, respectively; these were attributed to the high IDs and molecular weights. Meanwhile, the PI fibers showed better dimensional stability than the commercial P84 fiber, and this is beneficial for its security applications. (C) 2016 Wiley Periodicals, Inc.
机译：通过将含联苯单元的3,3'，4,4'-联苯四甲酸二酐（BPDA）引入到两步干纺工艺中，制备了具有增强的机械性能以及高热稳定性和尺寸稳定性的聚酰亚胺（PI）纤维均苯四甲酸二酐（PMDA）和4,4'-氧二苯胺的刚性均聚酰亚胺。衰减的全反射-傅立叶变换红外光谱结果表明掺入的BPDA部分加速了酰亚胺化过程并增加了前体纤维的酰亚胺化度（ID）。这归因于聚合物链分子移动性的提高。二维广角X射线衍射光谱表明，所制备的PI纤维具有良好的晶体结构，并且在晶体区域中的聚合物链沿纤维轴高度取向。 PI纤维的PMDA / BPDA的摩尔比为7/3，其最佳拉伸强度和模量值分别为8.55和73.21 cN / dtex。这些归因于高ID和分子量。同时，PI纤维显示出比市售P84纤维更好的尺寸稳定性，这对其安全性应用有利。 （C）2016威利期刊公司

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