Journal
ACS MACRO LETTERS
Volume 10, Issue 7, Pages 971-977Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.1c00357
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Funding
- JSPS KAKENHI Grants [19H02778, 20H02797]
- JST-Mirai Program [JPMJMI18E3]
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A mechano-responsive hydrogel was developed using the dissociation of a host-guest complex to induce phase transition of a thermoresponsive polymer, demonstrating a decrease in transmittance when mechanical stress was applied. This strategy provides a new approach for applications requiring controlled functions through applied stress.
We developed a mechano-responsive hydrogel that is driven by the dissociation of a host-guest complex. The hydrogel comprised a thermoresponsive linear polymer with adamantane as a guest molecule in its side chain and a nonthermoresponsive network structure with beta-cyclodextrin as a host molecule. Immobilization of the thermoresponsive polymer in the hydrogel via host-guest interaction resulted in a partial restriction of its phase transition, even above its lower critical solution temperature (LCST). The hydrogel demonstrated a decrease in transmittance when mechanical stress was applied at a temperature above its LCST, indicating that the phase transition of the thermoresponsive polymer was induced by the dissociation of the host-guest complex under mechanical stress. Moreover, this mechano-responsive behavior was repeatable by cooling the hydrogel to redissolve the thermoresponsive polymer. The strategy of the mechano-responsive phase transition will be useful for various applications that demand the control of desired functions by applied stress.
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