含氟/硅丙烯酸酯核壳型乳液的合成及性能

Synthesis and Properties of Core-shell Fluorosilicone-containing Acrylate Latexes

采用半连续种子乳液聚合法，在十二烷基硫酸钠（SDS）／辛基苯基聚氧乙烯醚（Tx-10）复合乳化剂的作用下，合成了以丙烯酸丁酯（BA）为核，以甲基丙烯酸甲酯（MMA）、甲基丙烯酸十二氟庚酯（DFHMA）、3-（甲基丙烯酰氧）丙基三甲氧基硅烷（MPTMS）和甲基三甲氧基硅烷（MTMS）为壳的核壳型含氟／硅丙烯酸酯聚合物乳液．利用FTIR，TEM，SEM—EDX和DSC等手段对乳液组成、乳胶粒子结构、膜表面及断面形态等进行了表征，讨论了氟／硅含量对聚合物膜性能的影响．结果表明，核-壳粒子尺寸为20～30nm，乳液膜的性能与膜表面氟和硅的含量及相容性有较大的相关性，当m（氟）：m（硅单体）=3：1时，形成的膜均匀透明，吸水率较低，尺寸稳定性较好．

The core-shell silicon-containing fluorinated acrylate latex was obtained via semi-continuous seed emulsion polymerization in which butyl acrylate （BA） served as the core, methyl methylacrylate （MMA）, methyl dodecafluorinacrylate （ DFHMA in commercial name ）, 3-methacryloxypropyltrimethoxysilane （MPTMS） and methyltrimethoxysilane（MTMS） （BA/MMA/DFHMA MPTMS/MTMS） served as the shell of copolymer. FFIR, SEM-EDX, and DSC were used not only to analyze the properties of the latexes and films, but also to investigate the effect of DFHMA and MPTMS/MTMS content on the latexes and films. TEM was employed for characterizing the morphology structure and the particle size of the core-shell latex. The results indicate that the copolymers presented uniform spherical core-shell partials with 20-30 nm in diameter, the content of F and Si element on the surface of films have a great effect on the characteristics of the films, and when m（DFHMA）/m（MPTMS ＋ MTMS） = 3/1, the film shows much more favorable characteristics both in latex and in film.