Study on Relaxation Temperature and Relaxation Behavior of Polyarylate Fibers
DING Xu1,2, SUN Ying1,2,*, CHEN Li1,2
1 School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China 2 MOE Key Laboratory of Advanced Textile Composites Materials, Tiangong University, Tianjin 300387, China
Abstract: Polyarylate fibers have excellent properties such as high strength and high modulus, high temperature resistance, wear resistance, creep resistance and relaxation resistance. It is an ideal choice for realizing lightweight and high-dimensional stability of deployable structures of spacecraft such as hot knife hold-down release devices, mesh antennas, space tethers, and inflatable space habitats. However, the stress rela-xation of polyarylate fibers under long-term loading seriously reduces the performance and reliability of spacecraft deployable structures. In order to further study the stress relaxation of polyarylate fibers, the relaxation temperature and relaxation mechanism of polyarylate were investigated by combining differential scanning calorimetry, dynamic mechanical analysis, and in-situ infrared spectroscopy. And the stress relaxation test system was designed and constructed to analyze the effect of load level on the relaxation behavior of polyarylate fibers. The results show that β-relaxation of polyarylate fibers occurs at 90 ℃, which is mainly related to the movement of benzene rings and ester groups. Further increase in temperature promotes molecular crystallization and aggregation of entanglement points, which increases the modulus of the fiber and keeps it relatively stable in a wide temperature range from 120 ℃ to 250 ℃. There are significant differences in the relaxation rates of fibers under different load levels. The relaxation rates under 75% breaking load are 4.46 and 3.01 times higher than those at 25% and 50% breaking load, respectively. The fitting results of the stress relaxation model indicated that the relaxation process of the polyarylate fibers consisted of two relaxation modes, and that the same molecular motions might be present at 25% and 50% breaking load. In order to ensure the working performance and reliability of the spacecraft structure, the service load of polyarylate fiber should be controlled below 50% of the breaking load.
丁许, 孙颖, 陈利. 聚芳酯纤维松弛温度及松弛行为研究[J]. 材料导报, 2025, 39(13): 24050099-7.
DING Xu, SUN Ying, CHEN Li. Study on Relaxation Temperature and Relaxation Behavior of Polyarylate Fibers. Materials Reports, 2025, 39(13): 24050099-7.
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2025, Vol. 39 
