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Construction of supramolecular hydrogels using imidazolidinyl urea as hydrogen bonding reinforced factor

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Abstract

The development of a new hydrogen bonding reinforced factor is of importance for the design and application of supramolecular hydrogels. Herein, we use a new reinforced factor, imidazolidinyl urea (IU), for the construction of hydrogen bonding supramolecular hydrogels. Poly(ethylene glycol) (PEG), three types of diisocyanates (isophorone diisocyanate (IPDI), 4,4′-methylene bis(cyclohexyl isocyanate) (HMDI) and 4,4′-methylene bis(phenyl isocyanate) (MDI)) and IU were employed to synthesize a series of polymers through hydroxyl-isocyanate chemistry. We found that increased IU content and hydrophobicity of the diisocyanates led to a higher gel–sol transition temperature of the polymer aqueous solutions, and the formed hydrogel showed great self-healing capability in response to external mechanical forces. Moreover, we found that improved diisocyanate hydrophobicity could endow the hydrogel with promising mechanical strength, with 1.6 MPa tensile stress and 460% elongation at the break. The advanced hydrogel can also efficiently dissipate energy during deformation and can quickly recover from 200% strain at room temperature without any assistance. Since IU is commercially available and ready for polymer preparation, our work provides a simple and convenient method for the development of hydrogen bonding supramolecular hydrogels with advanced properties.

Graphical abstract: Construction of supramolecular hydrogels using imidazolidinyl urea as hydrogen bonding reinforced factor

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Article information


Submitted
07 Feb 2020
Accepted
05 Mar 2020
First published
06 Mar 2020

J. Mater. Chem. B, 2020, Advance Article
Article type
Paper

Construction of supramolecular hydrogels using imidazolidinyl urea as hydrogen bonding reinforced factor

J. Yu, X. Chen, Y. Yang, X. Zhao, X. Chen, T. Jing, Y. Zhou, J. Xu, Y. Zhang and Y. Cheng, J. Mater. Chem. B, 2020, Advance Article , DOI: 10.1039/D0TB00331J

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