聚合物材料孔隙率的研究

以L-S相转化法成膜可以制得非对称型结构膜，这种膜结构具有极薄而致密的表层，有助于提高膜的选择性、渗透性及抗污染性，同时，探讨了孔隙率对膜结构和膜性能的影响．实验结果表明：用高分子做膜材料，可利用高分子的相容性控制膜的孔隙率；调控制膜的热力学和动力学因素可改变高分子的相容性，从而改善膜的结构和性能，实验结果证实了可以制备出PAN／PVC膜、PAN／PVA膜和用PVP制成孔剂的PVC膜。

Factors of porosity effecting of polymer blend membranes material

Asymmetric PAN/PVC PAN/PVA alloy microfiltration membranes(MF) and PVC membranes which used PVP aqueous solution as additive were prepared via L S phase inversion method. The MF membranes showed the ideal structure and excellent selectivity,permeability,stability,and fouling resistance properties. The effect of porosity was investigated. The results indicated that porosity could be adjusted by regulating the compatibility,the hydrophilicity of membrane could be improved by changing P1/P2 ratios. Both the thermodynamic and kinetic factors have a significant influence on the compatibility in membrane,furthermore on the structure and performance of membrane. The results showed that the PVC with PVP aqueous solution as an additive,PAN/PVC and PAN/PVA membranes were prepared by L S phase inversion method and the hydrophilic PVC membranes was achieved.