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采用硅烷偶联剂对氮化硼(BN)微米粒子进行表面处理,并在酚醛树脂(PF)的聚合反应过程中将其加入,制备出一种新型的有机/无机BN杂化环保型PF。采用红外光谱(FT-IR)、扫描电镜(SEM)和热重分析(TGA)等手段对杂化树脂的结构与性能进行了研究,并运用Kissinger、Ozawa和Crane方法计算其热分解反应的动力学参数。结果表明:杂化树脂的活化能和频率因子分别为126.1kJ/mol和1.64×108s-1(Kissinger法),反应级数为0.929(Crane法),其热分解反应机理比较复杂;经偶联剂处理过的BN粒子在PF中的分散性较好,BN杂化PF的耐热性略有提高;采用玻璃纤维增强杂化树脂制备BN杂化PF复合材料,其力学强度和电性能明显提高,拉伸强度由476.6MPa提高到610.5MPa,表面电阻率由2.88×1012Ω增加到1.92×1015Ω。
A new type of organic / inorganic BN hybrid environmentally friendly PF was prepared by surface treatment of boron nitride (BN) microparticles with a silane coupling agent and during the polymerization of phenolic resin (PF). The structure and properties of the hybrid resin were studied by FT-IR, SEM and TGA. The kinetics of thermal decomposition was calculated by Kissinger, Ozawa and Crane methods Learning parameters. The results showed that the activation energy and frequency of the hybrid resin were 126.1 kJ / mol and 1.64 × 108 s-1 (Kissinger method) respectively, and the reaction order was 0.929 (Crane method). The mechanism of thermal decomposition was complicated. The BN particles treated with BN had better dispersibility in PF and slightly improved heat resistance of BN hybrid PF. The mechanical strength and electrical properties of BN hybrid PF composites prepared by glass fiber reinforced hybrid resin were significantly improved , The tensile strength increased from 476.6MPa to 610.5MPa, the surface resistivity increased from 2.88 × 1012Ω to 1.92 × 1015Ω.