含羧基侧基的磺化聚芳醚砜复合反渗透膜的制备与性能研究

Preparation and properties of sulfonated poly(arylene ether sulfone)s bearing carboxylic acid groups for reverse osmosis membrane

利用双酚酸与4,4′-二氯二苯砜,3,3′-二磺化-4,4′-二氯二苯砜二钠盐的亲核取代反应,制备了新型的含有羧基侧基的磺化聚芳醚砜(C-SPAES),通过核磁光谱对其结构进行了表征.以所合成的C-SPAES为分离层材料,聚砜超滤膜为支撑层,采用刷涂法制备了复合型反渗透膜.扫描电镜照片显示该方法制备的反渗透膜表面平整,而且无缺陷.所制备的CSPAES复合反渗透膜具有良好的透水和截盐性能,其中C-SPAES-1.0复合反渗透膜,其对氯化钠的截留率可以达到90.2%,在2.0MPa下的水通量为11.4L/(m2·h).

Sulfonated poly（arylene ether sulfone） polymers bearing pendant carboxylic acid groups （CSPAES） were synthesized by direct copolymerization of 4,4＇-bis （4-hydroxyphenyl） valeric acid,4,4＇-dichlorodiphenyl sulfone and disodium 3,3＇-disulfonate-4,4＇-dichlorodiphenylsulfone.The expected structure of the polymer was confirmed by 1H NMR spectroscopy.Reverse osmosis membranes were obtained by the brushing method with C-SPAES as the functional material and an ultrafiltration membrane as the support layer.The SEM results indicated that the resulting reverse osmosis membranes had smooth surfaces,and no defects were observed.All the membranes showed improved water flux and salt rejection.Notably,C-SPAES-1.0,with C-SPAES content of 1.0%,exhibited a salt rejection of 90.2% and water flux of 11.4 L/（m2 · h） at 2.0 MPa.