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将三氯环硼氮烷(TCB)与甲胺/二甲胺进行共胺解取代反应,首先制得了不同胺基的取代单体,经过进一步热聚合反应合成了聚硼氮烷先驱体.通过对不同单体的聚合产物组成与结构分析,探讨了不同取代基对热聚合反应及产物结构的影响.研究表明,当控制甲胺/二甲胺摩尔比为1∶2,聚合温度180℃,获得的聚硼氮烷数均分子量为7603,分子量分散系数为1.80,熔点为83℃,组成为BC0.76N1.39H2.5,该聚合物具有近似线性分子结构,表现出优良的可纺性,可制得平均直径10～15μm的先驱体纤维,为制备氮化硼纤维奠定了基础.
The reaction of triclosan borazine (TCB) with methylamine / dimethylamine was carried out by co-aminating reaction, the substituted monomers with different amino groups were obtained firstly, and then polyborazine precursors were synthesized by further thermal polymerization. The effects of different substituents on the thermal polymerization reaction and the product structure were discussed. The results showed that when the molar ratio of methylamine / dimethylamine was 1: 2 and the polymerization temperature was 180 ℃, The obtained polyborazane has a number average molecular weight of 7603, a molecular weight distribution coefficient of 1.80, a melting point of 83 ° C and a composition of BC0.76N1.39H2.5. The polymer has an approximate linear molecular structure and exhibits excellent spinnability, The precursor fiber with the average diameter of 10 ~ 15μm can be obtained, which lays the foundation for the preparation of boron nitride fiber.