N-PMI改性酚醛树脂微球的制备及表征

Preparation and Characterization of the N-Phenyl Maleimide Modified Novolac Resin Microspheres

以N-苯基马来酰亚胺(PMI)改性酚醛树脂为原料、以硅油为分散和导热介质,采用悬浮聚合法制备单分散性较好的树脂微球。采用扫描电镜(SEM)研究炭化前后树脂微球的形态;采用热重分析(TG-DTG)研究了N-PMI改性酚醛树脂的耐热性;采用红外光谱(FT-IR)研究不同炭化温度树脂微球官能团的变化。研究表明,N-PMI改性酚醛树脂微球球形度完好,表面光洁,其粒径主要分布在10μm～20μm之间,其炭化产物是具有很好球形度的炭微球;该树脂微球具有优良的耐热性,其热分解起始温度为400℃,800℃的残炭率达61.8%。

The N-phenyl maleimide（N-PMI） modified novolac resin was used to prepare resin microspheres via suspension polymerization using silicone oil as dispersant.The morphology of N-PMI modified novolac resin microspheres was investigated through scanning electron microscope（SEM）.The thermal behavior of the resin microspheres was studied by thermogravimetric analysis（TG-DTG）.Moreover,The chemical structures of the resin microspheres at different pyrolysis temperature were characterized by Fourier transform infrared spectrum（FT-IR）.The results show that the resin microspheres with size of 10 μm～20 μm have fine degree of sphericity and smoothness.The resin microspheres possess excellent thermal properties as indicated by that initial thermal decomposition temperature is 400 ℃ and coke value arrives at 61.8 %.Moreover,the pyrolysis products of the resin microspheres are made up of carbon spheres with fine degree of sphericity.