含氟丙烯酸酯共聚乳液及其膜表面特性的研究

以十二烷基硫酸钠 (SDS)和OP 10混合乳化剂 ,制备了甲基丙烯酸全氟辛基乙酯 (FMA8) 甲基丙烯酸丁酯 (BMA) 甲基丙烯酸 (MAA)共聚乳液 .通过DSC、FT IR、1 H NMR对共聚物的结构、组成进行了表征研究 .采用JZHY 180界面张力仪研究了共聚乳液膜表面的性质 ,结果表明 ,随着共聚物中全氟单体含量的增加 ,共聚物膜的表面能显著降低 ,当全氟单体的含量达到 2 5wt %时 ,其表面能降低到 19 74mJ m2 .X ray光电子能谱(XPS)对共聚物表面原子组成的分析结果表明 ,共聚物表面氟的含量远高于其平均含量 ,证明了含氟基团的趋表现象 .经退火处理 ,共聚物膜表面的氟含量增加 ,表面自由能降低

PREPARATION AND SURFACE PROPERTIES OF ACRYLATE COPOLYMER LATEX CONTAINING FLUORINE

Copolymer latex containing perfluorooctylethyl methacrylate was prepared by emulsion polymerization using sodium dodecyl sulfate SDS and OP-10 as emulsifier.The copolymer was characterized by using DSC、FT-IR and 1H-NMR techniques.Surface properties of the copolymer film were measured by contact angle measurements (JZHY-180).The results show that the surface free energies of copolymer films decrease drastically with increasing the concentration of FMA8,and can reach 19.74 mJ/m 2 when the concentration of FMA8 used in copolymerization increases to 25 wt%.X-ray photoelectron spectroscopy (XPS) was used to investigate the atomic compositions of the surface of copolymers.It was found that the content of fluorine on the surface of copolymers is higher than the value calculated according to the feeds.Our investigation verified that groups containing fluorine tend to enrich at the copolymer-air interface.Through annealing treatment,the content of fluorine on the surface of copolymers was found to increase,which resulted in further decrease of surface free energies.