3种高性能纤维的热学性能(英文)

The thermal property of high performance fiber

对比研究Kevlar129、PBO和Kermel等3种高性能纤维热学性能.通过在氮气中的热重分析(TGA),发现PBO有较高的降解温度,初始降解温度为556.5℃,比Kevlar129和Kermel高出了约100℃.根据它们的降解特征温度,选择100, 200,300,400℃热处理1.5h,3种高性能纤维的强度和断裂伸长率都发生了下降,模量随温度变化是先增加后降低.PBO总体上显示了较好的力学保持性能.从它们断裂拉伸形貌可以看到各自的皮芯分布,但Kermel没有出现如PBO和Kevlar那样的带状原纤.

High performance aramid fibers display their outstanding high tenacity, high modulus and high temperature resistant under various section. Kevlar129, PBO and Kermel fibers are compared for thermal properties. It can be found that the PBO fiber has the highest thermal degradation temperature by TGA in nitrogen atmosphere, and its initial degradation temperature is 556. 5℃. Accordingly, when heated under 100, 200,300,400℃ for 1.5h, the tenacity and the extension to break of Kevlar129, PBO and Kermel fiber all decrease with temperature, but the modulus increase firstly then decrease. PBO generally has higher mechanical property retention. From the SEM observation to these fibers treated under heat, the morphology show their fracture failure mode when they are tensiled, and there exists fibrils in their core.