Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, PR China.
Macromol Rapid Commun. 2013 Jun 25;34(12):1002-7. doi: 10.1002/marc.201300242. Epub 2013 May 8.
Polymer hydrogels that are capable of spontaneously healing injury are being developed at a rapid pace because of their great potential in biomedical applications. Here, the self-healing property of tough graphene nanocomposite hydrogels fabricated by using graphene peroxide as polyfunctional initiating and cross-linking centers is reported. The hydrogels show excellent self-healing ability at ambient temperature or even lower temperatures for a short time and very high recovery degrees (up to 88% tensile strength) can be achieved at a prolonged healing time. The healed gels exhibit very high tensile strengths (up to 0.35 MPa) and extremely high elongations (up to 4900%). The strong interactions between the polyacrylamide chains and the graphene oxide sheets are essential to the mechanical strengths of the healed gels.
由于在生物医学应用中具有巨大的潜力，能够自发愈合损伤的聚合物水凝胶正在快速发展。在这里，报道了使用过氧石墨烯作为多功能引发和交联中心制备的坚韧石墨烯纳米复合水凝胶的自愈合性能。水凝胶在环境温度甚至较低温度下具有出色的自愈合能力，并且在较长的愈合时间内可以实现非常高的恢复度（高达 88%的拉伸强度）。愈合的凝胶具有非常高的拉伸强度（高达 0.35 MPa）和极高的伸长率（高达 4900%）。聚丙烯酰胺链和氧化石墨烯片之间的强相互作用对于愈合凝胶的机械强度至关重要。
