Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 8, Issue 15, Pages 3058-3063Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tb00331j
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Funding
- National Natural Science Foundation of China (NSFC) [51803165]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JQ-167]
- Key Laboratory Construction Program of Xi'an Science and Technology Bureau [201805056ZD7CG40]
- Young Talent Support Plan of Xi'an Jiaotong University
- Fundamental Research Funds for the Central Universities [xjj2018050]
- Opening Project of Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University [2019LHM-KFKT007]
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage, Ministry of Education (HUST)
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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.
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