以聚二甲基硅烷(PDMS)为原料,在高压釜内高温高压反应制备了聚碳硅烷(PCS)先驱体,经熔融纺丝制备了PCS纤维,研究了在190 C下不同不熔化时间对PCS纤维氧化增重、Si-H键反应程度、凝胶含量、氧含量及最终SiC纤维氧含量与性能的影响.研究表明,在不熔化过程中,PCS结构中的Si-H键与氧反应,在PCS分子间形成Si-O-Si交联结构.随着不熔化时间的延长,PCS纤维发生氧化增重、Si-H键反应程度提高、凝胶含量增加,SiC纤维中氧含量也逐渐增加.在不熔化保温3h,制备的SiC纤维强度可达2.52GPa.随着不熔化时间的进一步延长,SiC纤维氧含量增加,其强度逐渐降低.
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