高强度/多功能氧化石墨烯纳米复合智能水凝胶的制备

Preparation of Graphene Oxide Nanocomposite Intelligent Hydrogel with High Mechanical Strength/Multi-Function

以甲基丙烯酸N,N-二甲氨基乙酯(DMAEMA)和丙烯酸(AA)为单体,N,N-亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸铵(APS)和亚硫酸氢钠(NaHSO3)为引发剂,在氧化石墨烯(GO)水分散液中合成了高强度GO纳米复合智能水凝胶。研究了GO和交联剂MBA含量对高强度GO纳米复合智能水凝胶力学性能、热稳定性的影响。研究表明,GO纳米复合智能水凝胶的热稳定性、力学性能,随GO或MBA含量的增加其强度增加;当pH<6或pH>8时,GO纳米复合智能水凝胶具有pH敏感性;GO纳米复合智能水凝胶的低临界溶解温度(LCST)约为30℃;当NaCl浓度小于0.4mol/L时GO纳米复合智能水凝胶具有明显的离子强度敏感性。

Graphene oxide(GO)nanocomposite intelligent hydrogels with high mechanical strength were prepared by in situ polymerization in graphene oxide aqueous suspension,using methyl acrylic acid,N,N-dimethyl amino ethyl ester(DMAEMA)and acrylic acid(AA)as raw materials,N,N-methylene double acrylamide(MBA)as crosslinking agent,ammonium peroxodisulfate(APS)and NaHSO3 as initiator.The effect of the content of GO and MBA on mechanical and thermal properties of GO nanocomposite intelligent hydrogel was investigated.The results show that the mechanical and thermal properties of the GO nanocomposite intelligent hydrogel increase by increasing the content of GO and MBA.Furthermore the GO nanocomposite intelligent hydrogels exhibit clearly pH sensitivity(at the pH<6or pH>8)and low critical solution temperature(LCST)around 30 ℃.In addition,the GO nanocomposite intelligent hydrogel has ionic sensitivity with the concentration of NaCl<0.4mol/L.