氧化石墨烯含量对复合水凝胶性能的影响

目的研究氧化石墨烯含量对氧化石墨烯/聚乙烯醇/聚丙烯酸复合水凝胶性能的影响。方法将氧化石墨烯作为物理交联剂,改变氧化石墨烯的相对含量,制备氧化石墨烯/聚乙烯醇/聚丙烯酸复合水凝胶,并分析其结构、热稳定性、力学、平衡溶胀比和弹性恢复能力。结果氧化石墨烯的含氧官能团与聚乙烯醇的-OH、聚丙烯酸的-COOH以氢键结合,增加氧化石墨烯相对含量可使复合水凝胶的热稳定性和力学性能得到増强,平衡溶胀比减小。结论在试验参数范围内,制得的氧化石墨烯/聚乙烯醇/聚丙烯酸复合水凝胶具有优异的热稳定性、力学性能和弹性恢复能力。

Effect of Graphene Oxide Contents on the Properties of Composite Hydrogels

The work aims to study the effects of graphene oxide content on the properties of graphene oxide/polyvinyl alcohol/polyacrylic acid composite hydrogels. Graphene oxide/polyvinyl alcohol/polyacrylic acid composite hydrogels were prepared by changing the content of graphene oxide (used as a physical crosslink agent). The structure, thermal stability, mechanical properties, equilibrium swelling ratio and elasticity recovery of composite hydrogels were analyzed. Oxygen-containing functional groups of graphene oxide were bounded with -OH of polyvinyl alcohol and -COOH of polyacrylic acid as hydrogen bond. The increase in relative content of graphene oxide could enhance the thermal stability and mechanical properties of composite hydrogels, and decrease the equilibrium swelling ratio. Within the range of test parameters, the graphene oxide/polyvinyl alcohol/polyacrylic acid composite hydrogels prepared have excellent thermal stability, mechanical property and elasticity recovery.