辉光放电电解等离子体法制备VMT/P(AMPS-co-AA)高吸水树脂

在水溶液中，以蛭石(VMT)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)和丙烯酸(AA)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)引发制备蛭石/聚(2-丙烯酰胺-2-甲基丙磺酸-co-丙烯酸)(VMT/P(AMPS-co-AA))复合高吸水树脂。考察了放电电压、放电时间、蛭石用量和交联剂含量对复合高吸水树脂吸水溶胀性能的影响，用FT-IR、XRD、TG、SEM对复合高吸水树脂的结构、形貌和热稳定性进行了表征，同时探讨了可能的引发聚合机理。结果表明, VMT 表面的羟基与AMPS和AA中的C=C键发生接枝共聚形成了无机/有机无定形共聚物，该材料表面呈现粗糙、多孔的三维网状结构，热稳定性良好，GDEP引发是一个自由基引发的链增长过程。

Synthesis of VMT/P(AMPS-co-AA) Superabsorbent Composites by Glow-discharge Electrolysis Plasma

A vermiculite/poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-acrylic acid) (VMT/P(AMPS-co-AA)) superabsorbent composites was prepared in aqueous solution by glow-discharge electrolysis plasma (GDEP) as initiator and N,N'-methylene-bis-acrylamide as a cross-linker. The reaction parameters affecting the equilibrium swelling (i.e., discharge voltage, discharge time, vermiculite content, and content of crosslinker) were systematically optimized to achieve a superabsorbent composites with a maximum swelling capacity. The structure, thermal stability and morphology of VMT/P(AMPS-co-AA) were characterized by FT-IR, XRD, TG and SEM. In addition, a possible copolymerization mechanism initiated by GDEP was proposed. The results showed that AM and AMPS monomers have grafted onto VMT successfully by GDEP forming an amorphous composite. The VMT/P(AMPS-co-AA) exhibits a rough and porous structure with visible wrinkles and has a higher thermal stability. Copolymerization mechanism initiated by GDEP is a free radical reaction process.