Add time:08/20/2019 Source:sciencedirect.com
Water absorption resins of pullulan graft methyl acrylate (PU-g-MA) using ceric ammonium nitrate (CAN) as an initiator has been investigated under nitrogen atmosphere in aqueous medium. The percentage grafting (%PG) is favoured by increasing reaction time but is affected by higher concentration of initiator and monomer, and high temperature. Experiments showed that the optimal conditions for grafting were: [CAN] = 0.004 mol/l which was added in 1 mol/l nitric acid; [MA] = 0.0465 mol/l; reaction time; 180 min and temperature, 40 °C. The graft copolymer was analyzed by infrared spectroscopy. The water absorption capacity of the resins decreased significantly with the increase in %PG.
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