Catalytic poly(vinyl alcohol) functionalized membranes obtained by gamma irradiation

Polymeric catalytic membranes bearing sulfonic acid functions have been prepared by mutual gamma irradiation at a 60Co source, of poly(vinyl alcohol) (PVA) membranes and methanesulfonic acid. The effect of various synthesis conditions on membranes' physical–chemical properties and catalytic activity in the esterification reaction between acetic acid and isoamyl alcohol to obtain isoamyl acetate (banana flavor), was evaluated. The membranes were characterized by ATR-FTIR, TPP, AFM and SEM. Water contact angle determinations were also performed. The obtained results showed that within the range of conditions studied the increase in sulfonic acid groups' content is accompanied by an enhancement in the membranes catalytic activity, while the increase in absorbed dose leads to a decrease in catalytic activity. - Highlights: ► Polymeric catalytic membranes bearing sulfonic acid functions as catalysts. ► Catalysts for esterification reaction between acetic acid and isoamyl alcohol. ► Better catalytic results with increase in sulfonic acid functions. ► Increase of radiation dose leads to a decrease of membranes' catalytic activity. ► Increase of membranes' hydrophobicity leads to a decrease in catalytic activity.