PVA作用下含氟丙烯酸酯共聚乳液的制备与表征

Preparation and characterization of perfluoroalkylethyl methacrylate copolymer emulsion with action of poly(vinyl alcohol)

摘要:

以聚乙烯醇（PVA）为乳化剂，采用Fe2+-H2O2引发体系，以全氟烷基乙基甲基丙烯酸酯（FM）、丙烯酸丁酯（BA）、苯乙烯（St）、甲基丙烯酰氧乙基三甲基氯化铵（DMC）、丙烯酸羟乙酯（HEA）为主要单体进行乳液聚合制得了阳离子含氟丙烯酸酯多元共聚物乳液。通过FT-IR、1H-NMR、透射电镜（TEM）、示差扫描量热（DSC）及接触角测试对共聚物结构、乳胶粒径及形态、乳胶膜表面性能进行了研究。结果表明，该乳液乳液的粒子形态呈球形，单分散性良好，平均粒径为90-100nm；随着共聚物中含氟质量分数的增加，乳胶膜的表面自由能显著降低；退火处理有助于含氟基团迁移到乳胶膜表面，乳胶膜表面自由能进一步降低。

Abstract:

Cationic fluorinated acrylate polymer emulsion was prepared by emulsion polymerization of styrene (St), Methacrylatoethyl trimethyl ammonium chloride (DMC), butyl acrylate (BA), 2-hydroxyethyl acrylate (HEA), Perfluoroalkylethyl methacrylate (FM) using poly(vinyl alcohol) (PVA) as emulsifier and using Fe2+-H2O2 as initiator. FT-IR, 1H-NMR, TEM, DSC and contact angle measurements characterized the polymer structure, particle size and morphology of the emulsion, surface property of the film, respectively. The results show that the emulsion presents monodisperse and particles size is 90-100nm. The surface free energies of the copolymer films decrease with increasing the concentration of FM. Annealing treatment enhanced the enriching tendency of fluorine-containing group at copolymer-air interface and decreased the surface free energies.