Abstract
AbstractSago starch has been graft copolymerized with acrylic acid (AAc) by mutual gamma radiation method. Reaction conditions such as total dose, monomer concentration and amount of methanol were optimized to obtain maximum grafting percentage. Maximum percentage of grafting, Pg (158.00%) was obtained at an optimum total dose of 62.64 kGy using 4.37 moles/L of AAc in 1 mL of methanol. Using optimum conditions, the effect of cross‐linker, glyoxal, on percent grafting was also studied and maximum grafting was obtained at [Glyoxal] = 54.70 moles/L. Characterization of the graft copolymer was carried out by FTIR, TGA, SEM, XRD analytical methods. The grafted Sago starch was found to have increased crystalline and improved thermal behavior. Swelling and solubility kinetics were measured for each of the samples and correlation between the effects of the reaction parameter on swelling‐solubility kinetics was evaluated. Maximum swelling (4192.3%) at 37°C in 8 h was observed for the sample with 59.9% graft level. Higher swelling percentage is indicative of the graft copolymer to have the properties of a hydro gels that can be utilized for use as drug delivery vehicle and purification of industrial effluents.
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