离子型共聚单体参与下的全氟丙烯酸酯无皂乳液共聚

离子型共聚单体参与下的全氟丙烯酸酯无皂乳液共聚;全氟烷基丙烯酸酯;无皂乳液;离子型共聚单体

Soap-free Emulsion Copolymerization of Perfluoroalkyl Acrylate In the Presence of Ionic Comonomers

The soap-free emulsion copolymerization of perfluoroalkyl acrylate(FA), methyl methacrylate(MMA) and n-butyl acrylate(n-BA) was carried out in the presence of sodium 2-acrylamide-2-methyl propanesulfonate(AMPSNa) as an ionic comonomer and potassium persulfate(KPS) as the initiator. The effects of reaction temperature and the concentrations of AMPSNa, KPS and FA on the kinetics of copolymerization, particle size and dispersive index(PDI), particle number per micro liter water(N p) were investigated, the electrolyte stability and centrifugation stability of the emulsions were characterized as well. The aqueous dynamic contact angle and water resistance of FA copolymers were determined. The results show that the diameter of latex particles decreases initially and then increases with increase of AMPSNa and KPS concentrations. The polymerization rate indicates the same trend, while the particle diameter increases gradually with increasing fluorinated monomer amount and temperature. Compared with the copolymers prepared by conventional emulsion polymerization, the aqueous dynamic contact angle as well as water resistance of these copolymers were greatly improved.