Facile fabrication of thermo/redox responsive hydrogels based on a dual crosslinked matrix for a smart on-off switch

Soft Matter
Na SunLiqiang Zheng

Abstract

Stimuli-responsive or "smart" soft materials have raised considerable attention due to their ability to spontaneously respond to external environmental variations and have a great potential for wide applications. Herein, a thermo/redox responsive hydrogel is facilely constructed based on a dual crosslinked matrix: the primary chemical crosslinked copolymer is composed of thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) and poly(ionic liquid), and the secondary physical crosslinking component is generated by the ionic coordination between iron ions and carboxyl groups in the poly(ionic liquid). The non-covalent ion coordination crosslinking is introduced into a covalently crosslinked network, which further strengthens the soft PNIPAM matrix and enhances the mechanical performances of the hydrogels. The excellent thermosensitivity of PNIPAM and the good conductive property of poly(ionic liquid) provide the hydrogel with an attractive performance as a thermo-responsive switch. Moreover, the trapped iron ions in the network endow the hydrogels with redox-responsiveness, which could be reversibly chemically oxidized and reduced. The mechanical strength of hydrogels could also be tuned by the crosslinked capacity of iron ions w...Continue Reading

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Citations

Jan 1, 2019·Cell Biology International·Han ZhaoQingjia Chi
Nov 16, 2018·Nanomaterials·Paola Sánchez-MorenoHouria Boulaiz
Oct 31, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Qi ZhouHong Wang

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Methods Mentioned

BETA
scanning electron microscopy

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