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采用实验室制备的纳米级甲基丙烯酸锌对纳米Si3N4进行表面原位聚合包覆改性,运用FTIR、TEM、SEM等方法对处理前后的纳米Si3N4粉末进行了表征和比较。结果表明:通过原位聚合的方法,使甲基丙烯酸锌与纳米Si3N4粉体表面的活性基团产生了化学键合,成功实现了对无机纳米粉体表面的有机化改性,有效地阻止了纳米Si3N4粉体的团聚;同时,讨论了改性剂用量对改性效果的影响,改性剂用量为5%时,纳米粒径较小,分布最窄。并对甲基丙烯酸锌在氮化硅表面原位聚合机理作初步探讨。
Nanosized Si3N4 nanosized Si3N4 powders were surface-modified by nano-scale prepared by laboratory, and characterized by FTIR, TEM, SEM and other methods. The results showed that: the in situ polymerization method, the zinc methacrylate and nano-Si3N4 powder surface active groups generated by chemical bonding, the successful realization of the inorganic nano-powder surface organic modification, effectively preventing the nano Si3N4 powder. At the same time, the effect of modifier dosage on the modification was discussed. When the modifier dosage was 5%, the nano-particle size was the smallest and the distribution was the narrowest. The mechanism of in situ polymerization of zinc methacrylate on the surface of silicon nitride was also discussed.