Pengaruh Suhu Reaksi pada Polimerisasi Hidrogel Berbasis Kitosan

Abstract

THE EFFECT OF TEMPERATURE ON CHITOSAN BASE DHYDROGEL POLYMERIZATION. The grafted copolymer chitosan-g-poly(acrylic acid) has been prepared in aqueous solution by free radical polymerization using benzoyl peroxide (BPO) as initiator and methylenebis acrylamide (MBA) as crosslinking agent. The experiment has been conducted using 1 L stirred batch reactor of glass in electric waterbath with condensor and mechanical agitation under inert atmosphere. The grafted copolymerization of monomer acrylic acid onto chitosan has been carried out with fixed condition i.e. : ratio of acrylic acid (AA) to chitosan (CTS) = 7.2; concentration of BPO 2.44% w/w; concentration of MBA 2.44% w/w; speed of mechanical agitation 200 rpm and 3 hours of reaction time but varied in temperature. The temperature has been varied at 30, 50, 70 and 900C. The water absorption capacities of CTS-g-PAA hydrogel was determined. The result of the experiment showed that the graft copolymer CTS-g-PAAproduced at 90oC had the highest water retention capacity of 41.68 g/g in distilate water and 42,55 g/g in 9% aqueous NaCl solution. The results of FT-IR analysis showed that for CTS-g-PAA hydrogel has six peaks of wavelength numbers at 1577, 1404, 1172, 1076, 713, and 632 cm-1. The results of morphology analysis using SEM showed that CTS-g-PAA hydrogel has phorous structure and more compact than pure chitosan