辉光放电电解等离子体法制备VMT/P(AMPS-co-AA)复合高吸水树脂

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

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、蛭石用量和交联剂用量对复合高吸水树脂吸水溶胀性能的影响,并采用FTIR、XRD、SEM、TG对复合高吸水树脂的结构、形貌和热稳定性进行了表征,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。

A vermiculite / poly（ 2-acrylamido-2-methyl-1-propanesulfonic acid-co-acrylic acid）（ VMT / P（ AMPS-co-AA）） superabsorbent composite was prepared in aqueous solution with 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 obtain a superabsorbent composite with a maximum swelling capacity. The structure,thermal stability and morphology of VMT / P（ AMPS-co-AA） were characterized by means of FTIR,XRD,SEM and TG. In addition,a possible copolymerization mechanism in which GDEP was used as an initiator was proposed.The results show that AA and AMPS monomers have been grafted onto VMT successfully by GDEP to from an amorphous composite. The VMT / P（ AMPS-co-AA） exhibits a rough and porous structure and has a higher thermal stability. The copolymerization mechanism in which GDEP is used as an initiator is a free radical reaction process.