Dynamic Hydrogels with an Environmental Adaptive Self-Healing Ability and Dual Responsive Sol-Gel Transitions
Dynamic Hydrogels with an Environmental Adaptive Self-Healing Ability and Dual Responsive Sol-Gel Transitions
复制标题
具有环境自适应自愈能力和双重响应溶胶-凝胶转变的动态水凝胶
DOI：
10.1021/mz200195n
复制
发表时间：
2012-02-01
影响因子：
7.015
通讯作者：
Chen, Yongming
中科院分区：
文献类型：
--
作者：
Deng, Guohua;Li, Fuya;Chen, Yongming
通过将酰腙和二硫键结合在同一体系中，制备了具有环境适应性自修复能力和双重响应性溶胶-凝胶转变的动态聚合物水凝胶。水凝胶可以在酸性（pH 3和6）和碱性（pH 9）条件下通过酰腙交换或二硫键交换反应自动修复损伤。然而，水凝胶在pH 7下不能自愈合，因为两个键都被动力学锁定，而水凝胶通过在催化苯胺的帮助下加速酰腙交换而获得自愈合能力。所有的自我修复过程被证明是有效的，在室温下，在空气中没有外部刺激。该水凝胶还显示出独特的可逆溶胶-凝胶转变，响应于pH值（HCl/三乙胺）和氧化还原（DTT/H2 O2）触发。
Dynamic polymer hydrogels with an environmental adaptive self-healing ability and dual responsive sol-gel transitions were prepared by combining acylhydrazone and disulfide bonds together in the same system. The hydrogel can automatically repair damage to it under both acidic (pH 3 and 6) and basic (pH 9) conditions through acylhydrazone exchange or disulfide exchange reactions. However, the hydrogel is not self-healable at pH 7 because both bonds are kinetically locked, whereas the hydrogel gains self-healing ability by accelerating acylhydrazone exchange with the help of catalytic aniline. All of the self-healing processes are demonstrated to be effective without an external stimulus at room temperature in air. The hydrogel also displays unique reversible sol-gel transitions in response to both pH (HCl/triethylamine) and redox (DTT/H2O2) triggers.