微波辐射强化制备含氟硅丙烯酸酯共聚物乳液

Preparation of Fluorosilicone-containing Acrylate Latex with Enhancement of Microwave Irradiation

采用多步种子乳液聚合法,以丙烯酸丁酯、甲基丙烯酸甲酯、γ-(甲基丙烯酰氧)丙基三甲氧基硅烷和甲基丙烯酸六氟丁酯为原料在微波辐射下制备了核-壳型含氟硅丙烯酸酯共聚物乳液.并研究了共聚物的结构、乳胶粒的形态和聚合过程中粒径的变化.结果表明,所得乳胶粒子呈核-壳结构,与常规加热相比,微波的引用能加快反应速率,形成核-壳结构.壳层富集含氟硅聚合物的核-壳形态有利于含氟硅结构单元在聚合物膜表面的分布,当氟硅单体为6%(ω)时,乳胶膜对水的接触角达91.3o.加入氟硅组分显著提高了聚合物膜的耐水性,当其含量从0增大到18%时,乳胶膜的吸水率从20.1%降低到3.54%.

An acrylate copolymer latex with core-shell structure was synthesized by multi-step seeded emulsion polymerization under microwave irradiation with hexafluorobutyl methacrylate, 3-glycidoxypropyltrimethoxysilane and butyl acrylate and methyl methylaerylate as raw materials. The chemical structure of the copolymer was determined by FT-IR, the size changing of latex particles in the polymerization process characterized by PCS, and their morphology characterized by TEM and AFM. The results show that the copolymerization under microwave irradiation had higher reaction rate than traditional heating, and during the shell polymerization process, the monomers could be better polymerized in formation of core-shell particles. The water contact angle of film reached 91.3° when the content of hexafluorobutyl methacrylate and 3-glycidoxypropyltrimethoxysilane used in copolymerization was 6%. The water absorption rate of core-shell latex film decreased from 20.1% to 3.54% as the content of hexafluorobutyl methacrylate and 3-glycidoxypropyltrimethoxysilane increased from 0 to 18/%.