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首页> 外文期刊>Journal of Applied Polymer Science >Thermal mechanical and dynamic mechanical property of biphenyl polyimide fibers
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Thermal mechanical and dynamic mechanical property of biphenyl polyimide fibers

机译：联苯聚酰亚胺纤维的热力学和动态力学性能

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摘要

High-performance polyimide fibers possess man), excellent properties, e.g., outstanding thermal stability and mechanical properties and excellent radiation resistant and electrical properties. However, the preparation of fibers with good mechanical properties is very difficult. In this report, a biphenvl polyimide from 3,3',4,4'-biphenyltetracarboxylic dianhydride and 4,4'-oxydianiline is synthesized in p-chlorophenol by one-step polymerization. The solution is spun into a coagulation bath of water and alcohol via dry-jet wet-spinning technology. Then, the fibers are drawn in two heating tubes. Thermal gravimetric analysis, thermal mechanical analysis, and dynamic mechanical analysis (DMA) are performed to study the properties of the fibers. The results show that the fibers have a good thermal stability at a temperature of more than 400degreesC. The linear coefficient of thermal expansion is negative in the solid state and the glass transition temperature is about 265degreesC. DMA spectra indicate that the tandelta of the fibers has three transition peaks, namely, alpha, beta, and gamma transition. The alpha and gamma transition temperature, corresponding to the end-group motion and glass transition, respectively, extensively depends on the applied frequency, while the beta transition does not. The activation energy of a and gamma transition is calculated using the Arrhenius equation and is 38.7 and 853 kJ/mol, respectively. (C) 2004 Wiley Periodicals, Inc. [References: 23]
机译：高性能聚酰亚胺纤维具有优异的性能，例如优异的热稳定性和机械性能以及优异的抗辐射性和电性能。但是，制备具有良好机械性能的纤维非常困难。在该报告中，通过一步聚合在对氯苯酚中合成了由3,3'，4,4'-联苯四甲酸二酐和4,4'-氧二苯胺形成的联苯聚酰亚胺。通过干喷湿纺技术将溶液纺丝成水和酒精的混凝浴。然后，将纤维在两个加热管中拉伸。进行热重量分析，热力学分析和动态力学分析（DMA），以研究纤维的性能。结果表明，该纤维在高于400℃的温度下具有良好的热稳定性。固态的线性热膨胀系数为负，玻璃化转变温度约为265℃。 DMA光谱表明，纤维的tandelta具有三个过渡峰，即α，β和γ过渡。分别对应于端基运动和玻璃化转变的α和γ转变温度在很大程度上取决于所施加的频率，而β转变则不然。使用Arrhenius方程计算α和γ跃迁的活化能，分别为38.7和853 kJ / mol。 （C）2004 Wiley Periodicals，Inc. [参考：23]

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