石墨烯改性聚苯硫醚纤维光稳定性及其增强机制

为提高聚苯硫醚纤维的光稳定性，采用熔融复合纺丝技术，制备了一系列聚苯硫醚石墨烯（PPS-G）纳米复合纤维。表征了氙灯老化处理前后纳米复合纤维的力学性能保持率和熔融行为，探索了石墨烯对纳米复合纤维紫外光稳定性的增强机制。结果表明：老化处理192 h后，随着石墨烯质量分数的提高，纳米复合纤维的力学性能保持率显著增加。当石墨烯质量分数为1.0 %时，纳米复合纤维的断裂强度和断裂伸长保持率分别为80.2 %和90.6 %，相比纯纤维分别提高了23.08 %和26.1 %；光老化对PPS-G-1.0纳米复合纤维熔点的影响明显减小，纯纤维的熔点下降幅度为7.1℃，而PPS-G-1.0 纳米复合纤维熔点仅下降3.0℃；石墨烯对聚苯硫醚纤维的光稳定性具有很好的增强效果。

Light-stability and enhancement mechanism of polyphenylene sulfide fiber modified by graphene

In order to improve the light-stability of polyphenylene sulfide ( PPS ) fibers, PPS-graphene ( PPS-G) nanocomposite fibers were prepared by melt-mixing and melt spinning. The mechanical property retention ratio and the melting behavior of nanocomposite fibers before and after xenon lamp aging treatment were characterized by monofilament strength tester and differential scanning calorimeter so as to further investigate the enhancement mechanism of graphene contents on ultraviolet stability of nanocomposite fibers. The results show that the mechanical property retention ratio of nanocomposite fibers after 192 h of aging treatment increases significantly with the increase of the graphene content. When the content of graphene is 1. 0%, the breaking strength and the elongation retention ratio of treated nanocomposite fiber are 80. 2% and 90. 6%, respectively, which increase by 23. 8% and 26. 1% in comparison with those of pure fibers. In addition, dissolving temperature of pure fibers after treatment decreases by 7. 1 ℃ while that of PPS-G-1. 0 nanocomposite fiber after light-aging decreases only by 3. 0 ℃ , indicating that influences of light-aging on melting point of PPS-G-1. 0 nanocomposite fibers reduce obviously. The results show graphene are adapted to speculate the light-stability enhancement mechanism of polyphenylene sulfide fiber.