PAN/CA共混复合膜的气体分离与力学性能

Gas Separation and Mechanical Performance of PAN/CA Blend Composite Membranes

聚丙烯腈(PAN)具有较高的气体渗透性,但拉伸强度低,不适宜直接制膜。为达到气体分离膜在力学强度方面的使用要求,利用PAN与乙酸纤维素(CA)共混改善其拉伸性能。结果表明,采用相转化法制备的PAN/CA共混基膜,随着CA与PAN共混比的增加,拉伸强度有明显的上升趋势,由1.74MPa增加到2.08MPa。当共混比为0.10时,在此基膜上涂覆质量分数为8%的硅橡胶制得的复合膜,氧氮选择性可达到2.08,氧气透量为100.5GPU(1GPU=10-6cm3(STP)/cm2.s.cmHg)。

Polyacrylonitrile（PAN） has good gas permeability but bad tensile strength.To meet the requirement on mechanical strength of gas separation membranes,PAN blend with cellulose acetate（CA） was used as membrane preparation material.The result shows that tensile strength of PAN/CA blend membranes are be enhanced obviously with the increase of PAN/CA blend ratio.When the blend ratio is 0.10,the tensile strength of support membranes can be increased from 1.74MPa to 2.08MPa.When the blend membranes are coated with 8%（%） poly（dimethylsiloxane）,the selectivity of oxygen to nitrogen is 2.08 and the oxygen permeability can reach 100.5 GPU（1GPU=10-6cm3（STP）/ cm2·s·cmHg）.