用于复合纳滤膜的PAN基底膜的改性及性能表征

采用湿法相转换法制备PAN基膜,并对基膜进行改性,使其腈基水解生成羧基.通过环境扫描电镜观察了改性前后的膜孔形态,利用测接触角对改性前后膜的亲水性进行比较,用红外光谱对改性前后的膜组成进行比较.结果表明,改性后的膜的亲水性增强,改性膜上有羧基生成且性能得到了提高.

Modification and performance of PAN support membrane for composite nanofiltration membranes

PAN support membranes were prepared by wet phase-inversion method, and the membranes were modified in order to make the nitrile group hydrolyze into the carboxyl group. To compare the performances of the membranes before and after modifying, the membrane morphology was observed by means of environmental scanning electric microscopy (ESEM) and hydrophilicity was studied by the determination of contact angle of the membranes. Additionally, the membranes were investigated by the help of infrared spectrum (FTIR). The result showed that the modified membranes were more hydrophilic than the unmodified membranes due to the carboxyl groups on the former and the performances of the former were better than the latter.