含氟硅丙烯酸酯核壳乳液及涂膜表面性能

在可聚合阴离子乳化剂体系下，以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)为主要单体，甲基丙烯酸十二氟庚酯(DFMA)、γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)为功能单体，采用半连续种子乳液聚合法合成了含氟硅丙烯酸酯核壳乳液。考察了DFMA和KH-570用量对乳液聚合过程和乳胶膜表面疏水性能的影响，并对乳胶膜的表面自由能进行了估算。采用傅里叶红外光谱(FT-IR)、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)对氟硅丙乳液及乳胶膜进行了表征。研究结果表明，氟硅单体有效地参与了聚合，乳胶膜中氟硅元素呈梯度分布，当氟硅丙乳液中DFMA和KH-570用量分别为16%和5%（质量分数）时，涂膜-空气界面与去离子水的接触角为110.6°，涂膜的表面能低至15.4 mN·m^-1，其疏水性和耐热性有较大幅度提高。

Synthesis of core-shell polyacrylate emulsion containing fluorine and silicon and surface properties of latex films

The core-shell polyacrylate emulsion containing fluorine and silicon in the shell was synthesized by semi-continuous seeded emulsion polymerization in the presence of reactive anionic emulsifier, using methyl methacrylate (MMA) and butyl acrylate (BA) as principal monomers, dodecafluoroheptyl methacrylate ( DFMA) and γ- ( methacryloxy) propyltrimethoxy silane ( KH-570 ) as functional monomers. The influences of the amount of fluorine and silicon monomers on emulsion polymerization process and surface hydrophobic properties of the latex films were discussed, and the surface free energies of prepared emulsion films were calculated. The fluorinated-silicated acrylate emulsion and their films were characterized by Fourier transform infrared spectrum (FT-IR), differential scanning calorimetry (DSC), thermogravimetry (TG), contact angle (CA) and X-ray photoelectron spectroscopy (XPS) analysis. The results showed that fluorine and silicon monomers had effectively copolymerized with acrylic monomers and a gradient distribution in the latex films was formed. The deioned water contact angle for film-air interface is 110. 6° and the surface free energy is as low as 15. 4 mN · M~(-1), when the amount of DFMA and KH-570 is 16% and 5 %, respectively. Both the hydrophobicity and thermal stability of the emulsion films were greatly improved.