| 摘要 |
PROBLEM TO BE SOLVED: To provide composite semipermeable membrane which is produced by coating one surface of polysulfone-based semipermeable membrane with a polyamide-based polymer thin film and is excellent in permeation performance, separation performance and in particular performance with respect to the removal of organic matter. SOLUTION: This composite semipermeable membrane consists of polysulfone- based semipermeable membrane and a polyamide-based polymer thin coating film formed on one surface of the polysulfone-based semipermeable membrane, wherein in a surface infrared absorption spectrum of the surface on the polyamide coating film side of the composite membrane, the ratio T (Aa/As) of the absorption intensity (Aa) of an absorption peak being at 1,600 to 1,700 cm-1, due to C=O of the polyamide, to the absorption intensity (As) of an absorption peak being at about 1,586 cm-1, due to the polysulfone, is 0.05 to 3.
|
