NOVEL INTERFACIALLY-POLYMERIZED POLYAMIDE COMPOSITE MEMBRANES: CORRELATION BETWEEN FINE-STRUCTURE CHARACTERIZATION AND PERVAPORATION PERFORMANCE

摘要

@@Interfacial polymerization is based on a reaction that forms a polymer film at the interface between two immiscible phases. In each of these phases, a highly reactive monomer (amines and acyl chlorides) is dissolved. Polyamide thin-film composite (TFC) membranes are multilayered. It is essential to characterize multilayered membranes by using several techniques such as AFM, SEM, TEM, FTIR and ESCA. This is because that each analytical technique has its advantages and shortcomings in structural determination and elemental sensitivity. A novel physical technique, positron annihilation spectroscopy (PAS), can be utilized to measure physical properties of membranes with multiple layers, such as free volumes at the atomic and molecular levels as a function of chemical changes and molecular modifications at different depths in a multilayer system. PAS is a potential physical technique. This is because many studies on the physical properties of polymeric materials probed by PAS have been investigated recently.