Preparation of poly(vinyl alcohol)-graft-N-isopropylacrylamide copolymer membranes and permeation of solutes through the membranes

✍ Scribed by Takamasa Nonaka; Tomonari Ogata; Seiji Kurihara

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 483 KB
• Volume: 52
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1994.070520713

✦ Synopsis

Thermosensitive copolymers were prepared by graft copolymerization of N-isopropylacrylamide onto poly(viny1 alcohol) in dimethyl sulfoxide (DMSO) using potassium peroxodisulfate as an initiator. The phase transition temperature was measured by differential scanning calorimetry. The copolymers exhibited almost the same transition temperature (about 33°C) as that of poly(N-isopropylacrylamide) regardless of the composition of the copolymers. The copolymer membranes were obtained by evaporating solvent from the DMSO solution of the graft copolymers and were insolubilized by annealing the membranes at 12OOC for 10 h. Permeation of the lithium ion and Methylene Blue through the membranes was investigated at various temperatures. The permeation of solutes was greatly affected by temperature, i.e., the permeation of the solutes could be controlled at temperatures below and above 33OC.