采用原位乳液聚合法,在可聚合阴离子乳化剂/非离子乳化剂复配体系下,以γ-甲基丙烯酰氧丙基三甲氧基硅烷(KH-570)改性的纳米SiO2、甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、丙烯酸(AA)等为核相组成,以MMA、BA及甲基丙烯酸十二氟庚酯(DFMA)为壳相单体,合成纳米SiO2/含氟聚丙烯酸酯复合乳液.考察了纳米SiO2和DFMA用量对乳液聚合过程及乳胶膜表面疏水性能的影响.通过透射电子显微镜(TEM)、差示扫描量热仪(DSC)、热重(TG)、接触角(CA)及X射线光电子能谱(XPS)等方法表征乳液的结构及形态、乳胶膜的表面性能和耐热性能.结果表明,纳米SiO2>/含氟聚丙烯酸酯共聚物复合粒子呈现出明显的核壳结构,乳胶膜中氟元素呈梯度分布;纳米SiO2粒子的引入不仅提高了乳胶膜的疏水性,也在一定程度上改善了聚合物膜的耐热性能.%The core-shell nano-SiO2/fluorinated polyacrylate emulsion containing fluorine in the shell was synthesized via in-situ emulsion polymerization in the presence of reactive anionic emulsifier and nonionic emulsifier, with the core phase consisting of nano-SiO2 modified by γ- (methacryloxy) propyltrimethoxy silane (KH-570), methyl methacrylate (MMA), butyl acrylate (BA) and acrylic acid (AA), and the shell phase monomer consisting of methyl methacrylate (MMA), butyl acrylate (BA) and dodecafluoroheptyl methacrylate (DFMA). The influence of the amount of nano-SiO2 and fluorine-containing monomer (DFMA) on the emulsion polymerization process and surface hydrophobic properties of the latex films was discussed. The nano-SiO2/fluorinated polyacrylate emulsion and its films were characterized by transmission electron microscopy (TEM), differential scanning calorimetry (DSC), thermogravimetry (TG), contact angle (CA) and X-ray photoelectron spectroscopy (XPS) analysis. The results showed that the resultant particles had core-shell structure and a gradient distribution of fluorine in the latex films was formed. The core-shell nano-SiO2/fluorinated polyacrylate latex film showed higher hydrophobicity and thermal stability comparing with fluorinated polyacrylate latex film due to the addition of nano-SiO2.
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