采用原位生成法对硼酚醛树脂(BF)进行了纳米TiO2粒子改性,并采用傅立叶变换红外光谱、热重分析等测试方法对改性前后BF的结构、热性能进行了表征和对比,在此基础上对比了高硅氧纤维(HSGF)、碳纤维(CF)增强BF复合材料的弯曲性能和耐烧蚀性能.结果表明,纳米TiO2具有尺寸小、比表面积大等典型的纳米效用,这些特征使纳米TiO2与聚合物形成强物理化学作用,提高两者的结合力.加入质量分数3％的纳米TiO2可使BF的热残留率提高12％.BF/CF/TiO2复合材料的力学性能和耐烧蚀性能最优,其弯曲强度较BF/CF复合材料提高6％,拉伸强度提高19％,压缩强度提高12％;而BF/HSGF/TiO2复合材料的弯曲强度较BF/HSGF复合材料提高8％,拉伸强度提高15％,压缩强度提高10％.%The nano-TiO2 particles were modified by the in-situ generation method for boron-phenolic resins(BF). The struc-ture and thermal properties of the modified BF resin were characterized and compared by FTIR and TG test methods. Theflexural and ablative properties of high silicafiber (HSGF) and carbonfiber (CF) reinforced boron phenolic resin composites were compared. The results show that nano-TiO2 has typical nanometer effect such as small size and large specific surface area,these characteristics make the nano-TiO2 and polymer forming strong physical and chemical effects,improve the bonding force. The addition of 3％ nano-TiO2 can improve the BF resin thermal residual rate of 12％. The mechanical properties and ablative property of BF/CF/TiO2 are optimal. Compared with BF/CF composites,flexural strength of the BF/CF/TiO2 is increased by 6％, the tensile strength is in-creased by 19％, the compressive strength is increased by 12％. While compared with BF/HSGF composites, theflexural strength of BF/HSGF/TiO2 is increased by 8％, the tensile strength is increased by 15％ and the compressive strength is increased by 10％.
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