微乳液聚合耦合共混法构建聚偏氟乙烯共混杂化膜

Fabrication of PVDF Hybrid Blending Membrane via Microemulsion Polymerization Coupling with Blending Method

以苯乙烯和甲基丙烯酸甲酯混合物作为油相,采用反相微乳液法制备了Ag Cl纳米粒子;通过微乳液原位聚合油相单体得到包含Ag Cl纳米粒子的聚合乳液;将聚合乳液与聚偏氟乙烯(PVDF)通过共混法构建了包含Ag Cl纳米粒子的PVDF共混杂化膜.紫外-可见光谱、透射电子显微镜(TEM)及扫描电子显微镜(SEM)等表征结果和超滤实验结果表明,聚合乳液加入的同时引入了亲水性聚合物和表面亲水的Ag Cl纳米粒子,不仅改善了PVDF共混杂化膜的孔隙率和平均孔径,还显著增强了PVDF共混杂化膜的极性和亲水性,最终提升了膜的水通量和抗污染性能;过量聚合乳液加入后不能与PVDF材料均匀共混,而且Ag Cl纳米粒子也会在膜中形成团聚物堵塞膜孔隙,从而削弱了膜的水通量和抗污染性能.

AgCl nanoparticles were obtained in the reverse microemulsion using styrene and methyl methacrylate mixture as an oil phase. And then,polymer emulsion containing AgCl nanoparticles was obtained through in-situ polymerization of oil monomers in the microemulsion. Finally,polyvinylidene fluoride( PVDF) blending hybrid membranes containing AgCl nanoparticles were constructed by blending method. The results from the structural characterization and ultrafiltration experiments, such as UV-visible spectroscopy, transmission electron microscopy( TEM),and scanning electron microscopy( SEM),showed that the addition of some polymer emulsion combined with hydrophilic polymer and AgCl nanoparticles with hydrophilic surface did not only improve the porosity and average pore size of the PVDF blending hybrid membranes,but also enhanced the polarity and hydrophilicity of the hybrid membranes,thus increasing the water flux and antifouling performance of the membranes. However,the addition of excess polymer emulsion could not blend uniformly with PVDF. Moreover,AgCl nanoparticles would form agglomerates in the membrane to clog the membrane pores.Thereby,the water flux and antifouling performance of the membranes were both weakened.