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在水溶液中,以丙烯酸(AA)和蛭石(VMT)为原料,N,N′-亚甲基双丙烯酰胺(MBA)为交联剂,用辉光放电电解等离子体(GDEP)技术引发一步制备蛭石/聚丙烯酸高吸水性复合材料。采用FTIR、XRD对蛭石/聚丙烯酸的结构进行了表征,探讨了GDEP引发聚合和溶胀动力学行为的机制,研究了pH值和盐浓度对蛭石/聚丙烯酸平衡溶胀率的影响。结果表明,蛭石/聚丙烯酸高吸水性复合材料在蒸馏水中2h达溶胀平衡,溶胀过程遵循拟二级动力学模型;该复合材料具有pH敏感性、盐敏感性和可逆溶胀-消溶胀开关行为,其在单价阳离子溶液中的平衡溶胀率比二价阳离子溶液中的更高。
In aqueous solution, acrylic acid (AA) and vermiculite (VMT) as raw materials, N, N’-methylenebisacrylamide (MBA) as crosslinking agent, using glow discharge plasma electrolysis (GDEP) Preparation of vermiculite / polyacrylic acid superabsorbent composites. The structure of vermiculite / polyacrylic acid was characterized by FTIR and XRD. The mechanism of GDEP initiating polymerization and swelling kinetics was discussed. The effect of pH and salt concentration on the equilibrium swelling ratio of vermiculite / polyacrylic acid was also studied. The results showed that the vermiculite / polyacrylic acid superabsorbent compositon swelled in distilled water for 2h, and the swelling process followed the pseudo-second-order kinetic model. The composites exhibited pH sensitivity, salt sensitivity and reversible swelling-deswelling behavior , Its equilibrium swelling rate in the monovalent cation solution is higher than in the divalent cation solution.