以二氯甲基硅烷、三氯化硼、六甲基二硅氮烷为起始原料,采用缩聚法合成了新型SiBNC陶瓷前驱体--聚硼硅氮烷(PBSZ),其产率达90%. 通过调节二氯甲基硅烷的用量可获得不同软化点的前驱体. 采用改进的毛细管流变仪,首次对熔融纺丝状态时PBSZ的流变特性进行了研究. 结果表明,PBSZ熔融纺丝时,剪切速率在10～110 s~(-1)范围内时,为切力变稀流体,非牛顿指数为0.83～0.90,表观粘度为440～2 460 Pa·s,粘流活化能约为142 kJ/mol. PBSZ纺丝性能良好,纤维连续无断头长度＞1 600 m,纤维直径＜20 μm.
Polyborosilazane(PBSZ), a novel precursor of SiBNC ceramic, was synthesized via polycondensation approach with a yield of about 90%(mass fraction) from dichloromethylsilane(MeHSiCl_2), boron trichloride(BCl_3) and hexamethydisilazane((CH_3)_3SiNHSi(CH_3)_3). Precursors with different softening points can be obtained by altering the dosage of MeHSiCl_2. Rheological study shows that PBSZ melt is a typical shear thinning fluid. The shear rate, the flow index, the apparent viscosity and the viscous flow activation energy are 10～110 s~(-1), 0.83～0.90, 440～2 460 Pa·s, and 142 kJ/mol, respectively. The as-synthesized polyborosilazane shows a good melt-spinning processability and continuous fibers with diameter ＜20 μm and length＞1 600 m can easily be obtained.
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