聚间苯二甲酰间苯二胺平板膜的制备及其性能研究

PMIA flat-sheet membranes were prepared by non-solvent induced phase inversion method. Specifically, poly(m-phenylene isophthalamide) (PMIA) as polymer materials, lithium chloride (LiCl), polyethylene glycol (PEG-400) and polyvinyl pyrrolidone (PVP) as additives were blended to form casting solution. The effects of polymer concentration, additive type and content on the structures and properties of PMIA membranes were systematically investigated. The results exhibited that with the increase of polymer concentration and LiCl content, the viscosity of the casting solution was enhanced, resulting in the decrease of pore size and pure water flux. While the polymer chains were stretched with the increasing content of PEG, which made pore size and water flux of membranes improved. Then, with increasing PVP additive, the pure water flux of the membrane was increased firstly and then decreased, and the hydrophilicity of the membrane became worse. When the mass fraction of PMIA was 9%, LiCl was 2.8% and PVP was 1.2%, the pure water flux of the membrane was as high as 1421.55 L·m^-2·h^-1· bar^-1 with 80% rejection of bovine serum albumin (BSA) maintained. The high permeability provided a new idea for the preparation of high-performance membrane materials.