{"title":"Photo- and thermo-responsive poly(ionic liquid) hydrogel regulated by hierarchical host–guest interactions","authors":"","doi":"10.1016/j.polymer.2024.127505","DOIUrl":null,"url":null,"abstract":"<div><p>Supramolecular hydrogels constructed through various host–guest interactions have attracted tremendous attention in view of their excellent dynamic and multi-stimuli responsive performances. Herein, benzyl (Bn) and azobenzene (Azo) grafted poly(ionic liquid)s (PILs) were prepared via a one-pot post-synthesis strategy. By virtue of the difference in binding affinity of Azo and Bn groups with the host compound cucurbituril [8] urea (CB[8]), the newly-developed supramolecular hydrogels exhibited distinctive photo- and thermo-responsive behaviors. Under UV light irradiation, PIL-Azo-Bn/CB[8] hydrogel got weaker, while a gel-to-sol transition was observed when treated by heating. Moreover, the above tunable behaviors were highly reversible. Variable-temperature measurements such as proton nuclear magnetic resonance and ultraviolet–visible spectroscopy illustrated that the photo- and thermo-regulated performances of PIL hydrogel were ascribed to the hierarchical host–guest interactions. As a prototype application in smart circuits, PIL hydrogel exhibited a photo- and thermo-tuned conductivity. Thus, our finding presented a novel and versatile platform to fabricate responsive functional hydrogels via host–guest interactions, which has great promising applications in smart materials and flexible sensors.</p></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":null,"pages":null},"PeriodicalIF":4.1000,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0032386124008413","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
引用次数: 0
Abstract
Supramolecular hydrogels constructed through various host–guest interactions have attracted tremendous attention in view of their excellent dynamic and multi-stimuli responsive performances. Herein, benzyl (Bn) and azobenzene (Azo) grafted poly(ionic liquid)s (PILs) were prepared via a one-pot post-synthesis strategy. By virtue of the difference in binding affinity of Azo and Bn groups with the host compound cucurbituril [8] urea (CB[8]), the newly-developed supramolecular hydrogels exhibited distinctive photo- and thermo-responsive behaviors. Under UV light irradiation, PIL-Azo-Bn/CB[8] hydrogel got weaker, while a gel-to-sol transition was observed when treated by heating. Moreover, the above tunable behaviors were highly reversible. Variable-temperature measurements such as proton nuclear magnetic resonance and ultraviolet–visible spectroscopy illustrated that the photo- and thermo-regulated performances of PIL hydrogel were ascribed to the hierarchical host–guest interactions. As a prototype application in smart circuits, PIL hydrogel exhibited a photo- and thermo-tuned conductivity. Thus, our finding presented a novel and versatile platform to fabricate responsive functional hydrogels via host–guest interactions, which has great promising applications in smart materials and flexible sensors.
期刊介绍:
Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics.
The main scope is covered but not limited to the following core areas:
Polymer Materials
Nanocomposites and hybrid nanomaterials
Polymer blends, films, fibres, networks and porous materials
Physical Characterization
Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films
Polymer Engineering
Advanced multiscale processing methods
Polymer Synthesis, Modification and Self-assembly
Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization
Technological Applications
Polymers for energy generation and storage
Polymer membranes for separation technology
Polymers for opto- and microelectronics.