Preparation and properties of high-flux poly(m-phenylene isophthalamide)ultrafiltration membranes
In this work,ultrafiltration membranes derived from poly(m-phenylene isophthalamide)(PMIA)were prepared using L-S phase inversion method with H2O and CaCl2 used as mixed additives.The effects of H2O and CaCl2 concentrations on the pore structure,porosity,water flux,and dextran retention performance of the ultrafiltration membranes were investigated,respectively.Results showed that the introduction of an appropriate amount of H2O as a cosolvent can enhance the CaCl2 solubility in the DMAc solvent,and reduce the exchange rate between solvent and non-solvent and delay phase separation,resulting in the formation of more developed sponge-like pores and straight finger-like pore structures and membranes with high porosity,high water flux and dextran retention rate.Similarly,adding an appropriate amount of CaCl2 to the casting solution can increase the thermodynamic stability of solution and also delay phase separation,since the ion-dipole interaction may disrupt the hydrogen bonds between PMIA molecules.With adding 10％(mass fraction)H2O and 4％CaCl2,the porosity of the prepared PMIA ultrafiltration membrane was as high as 73.7％,the pure water flux was 16 970 L/(m2·h·MPa),and the retention rate of 150 000 glucan and BSA were 90.5％and 98.9％,respectively.The prepared PMIA ultrafiltration membranes show a good application prospect.
万方数据
维普
