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Robust Hydrogel Adhesive with Dual Hydrogen Bond Networks. | LitMetric

Robust Hydrogel Adhesive with Dual Hydrogen Bond Networks.

Molecules

School of Materials Science and Chemical Engineering, Ningbo University of Technology, 201 Fenghua Road, Jiangbei, Ningbo 315211, China.

Published: May 2021

AI Article Synopsis

  • * A new adhesive was developed with a thin hydrogel layer on a tough substrate, featuring positively charged ammonium groups for strong bonding to various nonporous surfaces.
  • * The adhesive's dual hydrogen bond system enhances its mechanical properties, making it tough and stretchable, which allows for effective bonding to both dry surfaces and wet biological tissues, indicating potential for biomedical uses.

Article Abstract

Hydrogel adhesives are attractive for applications in intelligent soft materials and tissue engineering, but conventional hydrogels usually have poor adhesion. In this study, we designed a strategy to synthesize a novel adhesive with a thin hydrogel adhesive layer integrated on a tough substrate hydrogel. The adhesive layer with positive charges of ammonium groups on the polymer backbones strongly bonds to a wide range of nonporous materials' surfaces. The substrate layer with a dual hydrogen bond system consists of (i) weak hydrogen bonds between ,-dimethyl acrylamide (DMAA) and acrylic acid (AAc) units and (ii) strong multiple hydrogen bonds between 2-ureido-4[1H]-pyrimidinone (UPy) units. The dual hydrogen-bond network endowed the hydrogel adhesives with unique mechanical properties, e.g., toughness, highly stretchability, and insensitivity to notches. The hydrogel adhesion to four types of materials like glass, 316L stainless steel, aluminum, AlO ceramic, and two biological tissues including pig skin and pig kidney was investigated. The hydrogel bonds strongly to dry solid surfaces and wet tissue, which is promising for biomedical applications.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8124778PMC
http://dx.doi.org/10.3390/molecules26092688DOI Listing

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