Synthesis and properties of 4‐vinyl pyridine grafted SBS used as charged mosaic membrane

Abstract

Abstract The grafting of 4‐vinyl pyridine onto styrene‐butadiene‐styrene triblock copolymer by irradiation was studied. Cationic and anionic groups were introduced by sulfonation and methylation to obtain a charged mosaic membrane. The experiments showed an increased rate of grafting with the increase of irradation dose. The best concentration of monomer was at 20%. After grafting, the contact angle and the water content were tested and morphology studies were performed. Furthermore, the tensile strength of this membrane increased with increased percentage of grafting. After testing, the charged mosaic membrane had a reduced potential. Its anionic and cationic exchange capacitites were between 0.12 to 0.13 meq/g, and 0.24 to 0.343 meq/g, respectively. The ratio of exchanged capacity was up to 0.509. KCI and urea can be separated by dialysis. In the determination of a piezodialysis, the salt enrichment reached a percentage of 10.3.