期刊
ACS MACRO LETTERS
卷 1, 期 2, 页码 275-279出版社
AMER CHEMICAL SOC
DOI: 10.1021/mz200195n
关键词
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资金
- NSFC [20974034, 21090353, 20874109]
- Guangdong Natural Science Foundation [10351064101000000]
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.
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