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通过正交试验方法确定了SiO_2纳米粒子对酚醛树脂改性的最优条件为,反应温度80℃,反应时间180 min,反应物的配比:SiO_2纳米粒子:苯酚:甲醛为2.5:1:1.7。制备的改性酚醛树脂材料分别用热分析,傅里叶变换红外光谱和透射电镜进行表征。相比于未进行改性的酚醛树脂,SiO_2纳米粒子改性后,其热稳定性得到了明显的提升,最高可达525℃;另外在N_2的氛围中,820℃的烧蚀温度下,其固含量也增加至70%。
The optimum conditions for the modification of phenolic resin by SiO 2 nanoparticles were determined by orthogonal test. The optimal reaction conditions were as follows: reaction temperature 80 ℃, reaction time 180 min, molar ratio of reactants: SiO 2 nanoparticle: phenol: formaldehyde 2.5: 1: 1.7 . The prepared modified phenolic resin materials were characterized by thermal analysis, Fourier transform infrared spectroscopy and transmission electron microscopy. Compared with the unmodified phenolic resin, the thermal stability of SiO 2 nanoparticle has been significantly improved up to 525 ℃. In addition, in the N 2 atmosphere at 820 ℃, Solid content also increased to 70%.