Abstract: Cationic polystyrene-acrylate emulsion was modified by perfluoralkylacrylate with two-stage emulsifier-free polymerization，in which 2-(perfluoroalkyl)ethyl acrylate was used as the fluoro containing monomer，methacryloxyethyltrimethyl ammonium chloride（DMC）and acrylamide（AM）were used as the cationic and hydrophilic monomers，respectively. Structure and thermal stability of the copolymer were characterized by FTIR and thermogravimetic analysis（TGA），respectively. Effect of the fluoro-monomer content and temperature on the surface free energy of the copolymer latex films was analyzed. Results showed that when FEA content used in the copolymerization increased from 1.2% to 5%，the surface free energy of the copolymer films decreased drastically from 23.54 mJ/m2 to 15.27 mJ/m2. With a further increase in FEA content，the surface free energy reduced slowly. When FEA content increased to 9.8%，the surface free energy decreased to 14.83 mJ/m2. Through annelaing treatment of copolymer latex films with the temperature increase from 25 ℃ to 120 ℃，the surface free energy decreased from 15.27 mJ/m2 to 14.06 mJ/m2.

摘要： 采用两阶段无皂乳液聚合方法，以全氟烷基乙基丙烯酸酯（FAEA）为含氟单体，甲基丙烯酰氧乙基三甲基氯化铵（DMC）为阳离子单体，丙烯酰胺（AM）为亲水单体，在偶氮二异丁腈（AIBN）和2,2-偶氮[2-（2-咪唑啉-2-基）丙烷]二氢氯化物（VA-044）的引发作用下，合成了阳离子型全氟丙烯酸酯改性苯丙乳液。利用FTIR、TGA对共聚物结构和热稳定性进行了表征，分析了氟单体含量和温度对共聚物乳胶膜表面自由能的影响。结果表明，当FAEA含量从1.2%增至5%时，共聚物乳胶膜的表面自由能显著降低，从23.54 mJ/m2 降至15.27 mJ/m2；进一步增加FAEA含量，表面自由能降低缓慢，当FAEA含量为9.8%时，表面能降低到14.83 mJ/m2；对共聚物乳胶膜进行退火处理，当温度由25 ℃升高至120 ℃时，表面自由能由15.27 mJ/m2降低到14.06 mJ/m2。