魔芋辐照接枝丙烯酸及其产物吸水性能的研究

研究了魔芋-丙烯酸辐照接枝共聚条件及产物的吸水性能,结果表明接枝最佳配方为:魔芋粉∶丙烯酸∶NaOH(9.5mol/L)∶水=3g∶21ml∶17.8ml∶131ml。丙烯酸与魔芋粉配比为7∶1(体积质量比);丙烯酸中和度55%;辐照后胶体最佳烘干温度30℃,该温度下40~80目颗粒吸水倍数较大,常温120min时达最大吸水866.5倍。温度对产物吸水和胶体保水有一定影响,以60℃以下为宜。pH对产物吸水倍数影响明显,但不及离子浓度对产物吸水倍数的影响大。

THE PREPARATION AND WATER ABSORPTION OF A COPOLYMER FROM KONJAC-GRAFT-ACRYLIC ACID BY IRRADIATION

The konjac and acrylic acid were grafted by 4.0kGy()~(60)Co γ-rays irradiation.The water absorption property of copolymers was studied. The results showed that the optimum feed ratio was konjac powder∶acrylic acid∶NaOH(9.5mol/L)∶water=3g∶21ml∶17.8ml∶131ml.And the optimum reaction conditions: volume/mass ratio of acrylic acid and konjac was 7∶1,neutralization degree of acrylic acid was 55%,gel drying temperature was 30℃.The copolymer particle size of 40～80 mesh had the largest absorption of water,up to 886.5 times at room temperature.The water-absorption and water-holding capabilities were affected by temperature,and were better at the termperater lower than 60℃.The water absorption was also affected by pH and ion concentration of solution,and the ion concentration was the main factor.The largest water absorption at Na_2HPO_4-citric acid buffer was only 15.8% of which in distilled water at the optimum pH=6.