低分子量氯磺化聚乙烯对纳米Si3N4粉体表面处理

Surface Modification of Nano-Si_3N_4 Particles with Low-molecular-mass CSM

用降解氯磺化聚乙烯橡胶(CSM)的方法制备了低分子量氯磺化聚乙烯(LMCSM),将其作大分子表面改性剂对纳米氮化硅(Si3N4)粉体进行表面修饰,对改性前后的纳米Si3N4粉体采用沉降实验、FT-IR、TEM、TGA等方法进行了表征。结果表明,LMCSM对纳米Si3N4粉体的改性主要为化学改性,其化学利用率为54%,物理利用率为29%;改性后的纳米Si3N4粉体的表面自由能从142.6 J/M2降至66.89 J/M2,在三氯甲烷中分散良好。

Low-molecular-mass CSM was prepared by degrading CSM, and it was used to modify silicon nitride nanoparticles（ Si3N4）. The structure and surface properties of modified nano-Si3N4 were systematically characterized by FTIR, TEM, TGA, dispersion stabilization and contact angle measurement. The result shows that chemical modification is primary, the chemical and physical usage efficiencies of the macromoleeular coupling are 54% and 29% respectively. The surface free energy of modified nano-Si3N4 has been decreased from 142. 6 J/M^2 to 66.89 J/M^2, resulting in a good dispersibility of nano-Si3N4 in chloroform .