Pickering乳液聚合法原位制备杂化乳胶粒子

Hybrid Latex Particles Prepared in Situ by Pickering Emulsion Polymerization

有机-无机杂化乳胶粒子在涂料、电子、催化和医疗等领域具有广泛的用途。Pickering乳液聚合由固体粒子作为稳定剂稳定两相界面,不需要使用表面活性剂,可以用来制备有机-无机杂化乳胶粒子。本研究使用溶胶凝胶法制备了二氧化硅纳米粒子,并将其用作Pickering乳液聚合的稳定剂,制备有机-无机杂化乳胶粒子。将二氧化硅粒子分别以粉末体系和溶胶体系引入到无皂乳液聚合反应中,系统探讨了单体和引发剂类型、体系pH值等实验条件对杂化乳胶粒子形貌的影响。反应单体与水之间的界面张力对二氧化硅粒子的吸附具有明显影响,较大的界面张力更容易促进二氧化硅粒子在聚合物乳胶粒表面的吸附。本研究结果对于厘清Pickering乳液聚合机理以及无机粒子在两相界面上的吸附机制具有重要价值。

Organic-inorganic hybrid particles are widely used in coatings,electronics,catalysis and medical fields.Pickering emulsion polymerization employs solid particles as stabilizers to stabilize the twophase interface and does not require surfactants,which can be used to prepare organic-inorganic hybrid latex particles.Herein silica nanoparticles were prepared by sol-gel method and used as stabilizer for Pickering emulsion polymerization to prepare organic-inorganic hybrid latex particles.Silica particles were introduced into the soap-free emulsion polymerization in powder form and dispersion form.The effects of monomer,initiator type and pH value of the system on the morphology of the hybrid latex particles were investigated systematically.The results show that the interfacial tension between monomer and water has a significant effect on the adsorption of silica particles,and the higher interfacial tension facilitates the adsorption of silica particles on the surface of polymer latex particles.The research results are helpful to clarify the mechanism of Pickering emulsion polymerization and the adsorption mechanism of inorganic particles on the two-phase interface.