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以双酚A(BPA)、γ-氨丙基三乙氧基硅烷(KH-550)、多聚甲醛为原料,合成双酚硅氧烷型苯并 嗪(BZ),固化得到聚双酚硅氧烷型苯并 嗪(PB),再用 BZ 与溶胶-凝胶法合成的改性二氧化硅共混,固化得到双酚硅氧烷型苯并嗪/二氧化硅复合材料(PBS).采用FI-IR,1H NMR等分析手段对BZ的化学结构进行了表征;采用DSC对BZ固化性能进行研究,使用TG分析PBS的稳定性.结果表明:在氮气氛围中,BZ在181℃开环聚合;PB失重5%时的温度为302℃,失重10%时的温度为375℃,在800℃时的残炭率为53%;PBS失重5%时的温度为316℃,失重10%时的温度为407℃,在800℃时的残炭率为59%.聚合物表面及断面扫描电镜图像分析表明:BZ与溶胶-凝胶法合成的改性二氧化硅有较好的相容性且提高了韧性.“,”BZ was synthesized by using BPA, KH-550 and paraformaldehyde as raw materials. PB was formed by curing of BZ. Then PBS was obtained by curing of co-mixed BZ and modified silica. The chemical structure of BZ was characterized by FT-IR,1H NMR. The curing characteristics was studied by DSC and the thermostability was analyzed by TG. The results showed that ring opening polymerization of BZ was 181℃ in N2. To PB, the temperature of 5% weight loss was 302℃ and that of 10% weight loss was 375℃, while carbon residue was 53% in 800℃. For PBS, the temperature of 5% weight loss was 316℃ and that of 10% weight loss was 407℃, while carbon residue was 59% in 800℃. The SEM image of polymers indicated that bisphenol siloxane benzoxazine with modified silica had a good compatibility and ductibility.