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Anion-exchange membranes (AEMs) with various membrane structures were prepared by introducing various amines: trimethylamine (TMA), triethylamine (TEA), tri-n-propylamine (TPA) and tri-n-butylamine (TBA) into precursor membranes prepared from chloromethylstyrene (CMS)–divinylbenzene (DVB) and glycidyl methacrylate (GMA) – DVB. Their properties for ionic transport and anti-organic fouling were examined...
For poly(ethylene terephthalate), two equilibrium melting temperatures, 262°C and 276°C, were found with DSC. They should be assigned to two forms of crystals with the infinite crystal length, respectively. This finding made it possible every crystal form to derive the end surface free energy per unit area of crystals and the transition enthalpy of the ordered parts in the amorphous regions and using...
Nylon-6 (N6)/nylon-6,6 (N66) blend membranes were prepared from N6 blend solutions in calcium chloride-methanol mixture of the concentrates in order to investigate the possibility of porosity control. During the pore formation process, which took place at 10 and 20°C by adding water onto the blend solution surface in a cylindrical glass bottle, a four-phase structure of solid, gel 1, gel 2 and solution...
The possibility of porosity control in nylon-6 membranes was investigated. By adding water onto the surface of a concentrated nylon-6 solution in calcium chloride-methanol mixture in a cylindrical glass bottle, a three-phase structure of solid, gel and solution (in order from the top) appeared. The thickness of the gel phase was 2.5-4 mm and became larger as the time elapsed after adding water. ...
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