含氟超支化聚合物在离子液体中的表面行为

Surface behaviors of fluorinated hyperbranched polymers in ionic liquid

研究不同分子结构的聚缩水甘油醚-b-聚丙烯酸六氟丁酯超支化聚合物(PG-b-PHFBA)在离子液体([bmim][BF4])中的动态表面张力行为。通过Ward-Tordai方程计算了扩散系数,并讨论了分子结构对扩散因子的影响规律。结果表明:PG-b-PHFBA可以将[bmim][BF4]表面张力降低到约30 mN·m-1;丙烯酸六氟丁酯(HFBA)链长增加有利于降低表面张力,并有利于加速聚醚从体相到表面的扩散。扩散因子计算结果证明动态表面张力初期为纯扩散控制模式,后期为混合动力控制模式。

Dynamic surface tension behavior of fluorinated hyperbranched copolymers polyglycidyl ether - β - polyhexafluorobutyl acrylate （PG- β -PHFBA ） with various different structures in ionic liquid （I bmim 1 [ BF4 ] ） were studied. The diffusion coefficients were calculated via Ward and Tordai＇ s equation, and the effect of molecular structure on diffusion coefficient was discussed. Results showed that PG - b - PHFBA can reduce the surface tension of [ bmim][ BF41 to about 30 mN m-l; extension of carbon chain length of hexafluorobuty] acrylate （HFBA） group is helpful to reduce the surface tension and increase the adsorption rate of the polyether molecules from bulk phase to the ionic liquid/air surface. The calculation of diffusion coefficient illustrated that the dynamic surface tension data follows simple diffusion-controlled mechanism at the initial adsorption stage, and mixed diffusion -controlled adsorption mechanism dominated the adsorption in the later adsorption process.