含氟丙烯酸酯的细乳液共聚合研究

Miniemulsion Copolymerizaiton of Fluorinated Acrylate

以偶氮二异丁腈(AIBN)为引发剂,以SDS/FS-3100/OP-10为复合乳化剂,以十六烷为助稳定剂,采用细乳液聚合的方法,合成了不同氟含量的含氟丙烯酸酯共聚物。采用破乳沉淀的方法获得了含氟丙烯酸酯共聚物固体产品。采用红外光谱对共聚物的结构进行表征,结果表明,通过细乳液聚合法可以有效实现全氟烷基乙基丙烯酸酯、丙烯酸丁酯和甲基丙烯酸甲酯的三元共聚。水接触角测试表明,当含氟单体摩尔比例为5.7%时,共聚物的水接触角可以达到112°,体现出较好的疏水性。对共聚物的热性能表征结果表明,含氟丙烯酸酯共聚物的起始分解温度为354.2℃,比不含氟的丙烯酸酯共聚物起始分解温度高出40℃,耐热性能较好。

Fluorinated acrylates with different fluorine contents were synthesized by miniemulsion polymerization with AIBN as initiator,SDS/FS-3100/OP-10 as composite emulgator and hexadecane as co-stablizer. Solid fluorinated acrylates were prepared by demulsification with the adding of methanol into the emulsion systems. FTIR was used to characterize the structure of fluorinated acrylates. The results indicated that the miniemulsion polymerizations of perfluoroalkylethyl acrylate,butyl acrylate and methyl methacrylate were conducted successfully. Water contact angle characterization indicated that the water contact angle of fluorinated acrylate copolymer was 112° when the molar ratio of perfluoroalkylethyl acrylate was only5. 7%,showing the good hydrophobicity of fluorinated acrylate copolymers. Thermogravimatry analysis indicated that the initial decomposition temperature of fluorinate acrylate copolymer was 354. 2℃,showing well heat-resistant quality.