等离子体引发HEMA的RAFT接枝聚合改性聚丙烯多孔膜

Surface Modification of Porous Polypropylene Membrane by PlasmaInitiated RAFT Graft Polymerization of Hydroxyethyl Methacrylate

采用等离子体引发的可逆加成-断裂链转移(RAFT)接枝聚合法,以甲基丙烯酸羟乙酯(HEMA)为单体,对聚丙烯(PP)多孔膜表面作了亲水改性。研究了接枝聚合动力学,并以FT-IR、SEM、压汞、水通量等方法研究了改性膜的表面结构形态及孔结构。结果表明,等离子体引发的RAFT接枝聚合速率显著低于普通等离子体引发的接枝聚合速率。表面接枝率随着接枝聚合时间的延长呈线性增长趋势,同时改性膜的孔径和水通量随之减小。

A reversible addition fragment chain transfer（RAFT） graft polymerization initiated by plasma, with hydroxyethyl methacrylate （HEMA） as the monomer, was used to modify the surface of porous poly-propylene （PP） membrane for hydrophilicity improvement. After an investigation of the graft polymeriza- tion kinetic, the surface chemistry, the surface morphology and the porous structure of modified membranes were evaluated by FT-IR, SEM, mercury intrusion and water flux measurement. Results showed that the polymerization rate of the plasma initiated RAFT graft polymerization was dramatically lowered relative to that without RAFT agent. The grafting amounts on modified surfaces exhibited a linear increase with the increasing of polymerization time, and simuhaneously the pore sizes and the water fluxes of the modified membranes would be consecutively decreased.