基于Au-S配位作用，将有机小分子BACA修饰在TiO₂@Au纳米复合物表面并用作大交联剂，在反应单体、引发剂和催化剂存在下发生原位自由基聚合反应，制备了具有高强度的纳米复合水凝胶。探讨了纳米复合物交联剂对凝胶聚合物网络结构和机械性能的影响。结果表明，纳米复合水凝胶显现出均匀、致密的聚合物网络，相对于普通有机小分子作交联剂，该凝胶的拉伸应变和断裂强度分别提高了2倍和21倍。该纳米复合水凝胶在紫外、可见以及近红外光下显现出高效、快速的自修复行为。

Based on Au-S coordination,a small organic molecule BACA is modified on the surface of TiO₂@Au nano-composite,which is used as a macro cross-linking agent.With the presence of monomers,initiators and catalysts,a nano-composite hydrogel with high strength is prepared through in-situ radical polymerization.The effect of nano-composite on the network structure and mechanical properties of hydrogel is investigated.The results show that the nano-composite hydrogel exhibits a uniform and dense polymer network,and the tensile strain and fracture strength of the hydrogel are increased by 2 times and 21 times,respectively,compared with traditional hydrogel that is composed of small organic molecule cross-linking agent.The prepared hydrogel also exhibits efficient,rapid self-healing behavior under UV,visible,and near-infrared light.

燕宇(1995-),男,硕士研究生,研究方向为多功能纳米复合材料的制备与性能研究,yanyu@mail.hfut.edu.cn