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研究了光敏性聚合物刷修饰二氧化硅纳米粒子的制备及其乳化行为,提供了一种制备新颖“胶体体”微胶囊的方法.首先,在二氧化硅纳米粒子表面引入原子转移自由基聚合(ATRP)引发剂分子,通过表面引发ATRP得到含有香豆素侧基聚合物刷光敏性的纳米二氧化硅粒子(SiO2-PMMA-PCMA);然后,以该粒子为乳化剂制备油包水型的皮克林乳液;最后,在紫外光的照射下引发香豆素侧基的交联反应从而得到“胶体体”微胶囊.结果表明,香豆素单体7-(2-甲基丙烯酰乙氧基)-4-甲基香豆素(CMA)和SiO2-PMMA-PCMA在紫外光作用下都可以发生交联反应,以SiO2-PMMA-PCMA纳米粒子作乳化剂可以制备稳定的皮克林乳液,光交联后得到的“胶体体”微胶囊的平均粒径约为170μm.
The preparation and emulsification behavior of photopolymer brush-modified silica nanoparticles were studied, and a new method of preparing novel “colloid” microcapsules was provided.Firstly, atom transfer was introduced onto the surface of silica nanoparticles (ATRP) initiator molecules to initiate ATRP by surface to obtain photosensitive nano-silica particles containing coumarin side group polymer (SiO2-PMMA-PCMA); and then, using the particles as an emulsifier to prepare oil packets Water-based Pickering emulsion.Finally, under the irradiation of ultraviolet light, the cross-linking reaction of coumarin side groups was initiated to obtain “colloid” microcapsules.The results showed that coumarin monomer 7- (2- (CMA) and SiO2-PMMA-PCMA can all undergo cross-linking reaction under the action of ultraviolet light. SiO2-PMMA-PCMA nanoparticles can be used as emulsifier Stable Pickering emulsion, obtained after photocrosslinking “colloidal ” microcapsules average particle size of about 170μm.