摘要
以甲苯为连续相、水为分散相、十二烷基苯磺酸为乳化剂兼作催化剂、正戊醇为助乳化剂,制备反相微乳液.然后引入正硅酸乙酯(TEOS),在水核中形成二氧化硅纳米粒子.接着加入通过溶液聚合制备的甲基丙烯酸甲酯(MMA)和γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)共聚物的甲苯溶液,实现共聚物对纳米二氧化硅的包覆.通过TEM、FTIR、TG等测试,证实得到了共聚物包覆二氧化硅的核壳结构纳米粒,平均粒径约为36,nm.当共聚物中KH570质量分数为5%时,获得最高的包覆率,聚合物占复合粒子质量的47%.
Inverse microemulsions were prepared with toluene as continuous phase, water as dispersed phase, dodecylbenzene sulfonic acid（DBSA） as emulsifier and catalyst, and n-pentanol as co-emulsifier. Then tetraethylorthosilicates（TEOS） were introduced into the inverse microemulsion to hydrolyze and condense, forming nanosilica particles in the water pools. Subsequently the solutions of copolymer of methyl methacrylate（MMA） and γ-methacryloxypropyltrimethoxy silane（KH570） in toluene were added to the inverse microemulsion. Thus the nanosilicas were encapsulated by copolymer via the co-condensation reaction of silanols between the copolymers and silica. It was evidenced by TEM, FTIR, and TG characterization that the core-shell structured PMMA-silica nanocomposite particles with an average size of 36,nm were obtained. The mass fraction of polymers encapsulated in the nanocomposites was 47% when the mass fraction of KH570 in the copolymer was 5%.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2014年第4期321-325,共5页
Journal of Tianjin University：Science and Technology
关键词
反相微乳液
二氧化硅
包覆
纳米复合
inverse microemulsion
silica
encapsulation
nanocomposites
