含氟单体对阳离子氟碳无皂乳液性能的影响

采用有机助溶剂法,以甲基丙烯酸六氟丁酯(FA)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)、苯乙烯(St)、丙烯酸丁酯(BA)为反应单体,在N-甲基吡咯烷酮(NMP)作用下制备出阳离子氟碳丙烯酸酯共聚物无皂乳液(CFE)。通过凝聚率、沉淀量、动态激光光散射(DLS)、透射电镜(TEM)、接触角和吸水率等手段对CFE的稳定性、乳胶粒尺寸及形态、乳胶膜表面性能进行了表征。结果表明含氟单体用量增加,凝聚率明显提高,沉淀量略有下降;乳胶粒尺寸显著增加,粒径分布由单分散向多分散过渡;乳胶膜的表面性能大幅度提高,当m(FA)为20.14%时,吸水率和乳胶膜表面自由能可低至3.26%和21.11mJ/m2。

Effect of fluorinated monomer on properties of cationic fluorocarbon emulsifer-free emulsion

Cationic fluorocarbon emulsifer-free emulsion(CFE) was prepared with the emulsifier-free copolymerization of 2,2,3,4,4,4-hexafluorobutyl methacrylate(FA),methacrylatoethyl trimethyl ammonium chloride(DMC),styrene(St) and butyl acrylate(BA) via method of adding organic cosolvent.The emulsion stability,particle size and morphology of CFE were characterized by the coagulation ratio,precipitation ratio,dynamic laser light scattering(DLS) and transmission electron microscopy(TEM) respectively;the latex film surface properties were investigated by contact angle and water absorption ratio.The results showed that when the content of fluorinated monomer increased,the coagulation ratio rised apparently,but the precipitation ratio decreased slightly.Meanwhile,the latex particle size increased and the transition of particle size distribution was from mono-dispersion to multi-dispersions.At the same time,the latex film surface performance was greatly improved.When m(FA) was 20.14%,the water absorption ratio and the latex film surface free energy could be low to 3.26% and 21.11mJ/m2 respectively.