SiO_2/聚丙烯酰胺核壳复合材料的制备研究

Research on preparation of nano-SiO_2/polyacrylamide core-shell composite

首先使用KH-550对纳米SiO_2进行表面改性,通过测试其亲油化度(HD)值以及控制相关影响因素得到的最佳改性条件为:KH-550占单体质量分数的6%,反应温度为30℃,反应时间为1.5h。然后通过Schulman法配制含有改性纳米SiO_2和单体丙烯酰胺的微乳液,通过其表观透明度以及稳定性优选出的微乳液配方为:V(油)∶V(水)=3∶2,ω(乳化剂)=25%(占油相),ω(助乳化剂)=25%(占油相),ω(单体)=50%(占水相)。最后通过反相微乳液聚合制备出核壳结构的SiO_2/聚丙烯酰胺复合材料,对其进行了红外光谱分析和透射电镜分析表征。

Firstly,using silane coupling agent KH-550 to modify the surface of nano-SiO2,according to measuring HD value of modified nano-SiO2,the optimal modifying condition was selected that the mass fraction of KH-550 6%,the reaction temperature 30℃ and the response time 1.5 h.Secondly,using Schulman method,the microemulsion was got.To judge the compounding effect of micro-emulsion,the apparent degree of transparency and stability of micro-emulsion were observed.The optimized formula of microemulsion preparation was that V（oil）∶V（water）=3∶2,ω（emulsifier）=25%,ω（co-emulsifier）=25% andω（monomer）=50%.Finally,the composite was prepared through the inverse micro-emulsion polymerization method.The infrared spectrum analysis and transmission electron microscopy was used to characterize the product.