以三氯化硼(BCl3)、甲基二氯硅烷(SiHMeCl2)和六甲基二硅氮烷(HMDZ)为初始原料、甲胺(NH2Me)为交联剂合成的SiBN(C)前驱体分子为基础,聚合得到聚硼硅氮烷(PBSZ)前驱体聚合物.通过FTIR、NMR等对其结构进行分析发现,PBSZ除Si-B-N骨架结构外,还包含硼氮六元环状结构及局部交联结构.流变分析表明,PBSZ具有良好的可纺性,其流变性能对于纺丝工艺的设定具有重要作用.采用熔融纺丝对前驱体聚合物的可纺性进行了验证,制得的前驱体纤维表面光滑、结构致密,无明显孔洞结构,直径约18μm.
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