Enhanced resistance to the atomic oxygen exposure of POSS/polyimide composite fibers with surface enrichment through wet spinning
作者： Fangfang Liu , Haiquan Guo , Yong Zhao , Xuepeng Qiu , Lianxun Gao
DOI: 10.1016/J.EURPOLYMJ.2018.05.022
关键词:
摘要: Abstract We report a series of PI composite fibers containing polyhedral oligomeric silsesquioxane (POSS). These were fabricated by three-step process consisting the in situ polycondensation POSS and polyamic acid, wet spinning, thermal imidization. X-ray photoelectron spectroscopy (XPS) energy-dispersive proved that enriched surface POSS/PI during spinning. This enrichment enhanced resistance to atomic oxygen (AO) erosion. After exposing AO fluence up 2.93 × 1020 atoms cm−2, still displayed excellent resistance. With increased content from 0 wt% 20 wt%, retention fracture strength initial modulus considerably improved 54% 93% 64% 91%, respectively. Moreover, decay rates obviously decreased at same with 20 wt%. erosion larger further resulted more effective for higher content. XPS results suggested as well silicate passivated layers formed on fiber surfaces after exposure, these prevented
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