Copolymer nanocomposite hydrogels: Unique tensile mechanical properties and network structures

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Bibliographic Information

Published
2016-07
Resource Type
journal article
Rights Information
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/j.polymer.2016.04.039
Publisher
Elsevier BV

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Description

Abstract Copolymer-based nanocomposite hydrogels (NC gels) were synthesized through in situ copolymerization of two monomers, N -isopropylacrylamide (N) and N,N -dimethylacrylamide (D), in the presence of inorganic clay in aqueous solutions. The thermoresponsive transition of N-copolymer NC gels shifted toward higher (lower) temperature by copolymerization with hydrophilic (hydrophobic) monomers. A specific copolymer-NC gel (N/D-NC gel) showed an abnormal enhancement in tensile mechanical properties as compared with the corresponding homopolymer-NC gels. The swelling properties and glass transition temperature of the N/D-NC gels also showed a different trend compared to those of the other copolymer-NC gels. These unusual changes in the gel properties were observed at all clay concentrations, and could be attributed to the formation of a unique organic/inorganic network structure consisting of physical crosslinks due to the exfoliated clay and chemical crosslinks due to self-crosslinking of the N/D copolymer. The formation of a self-crosslinked network was also confirmed by the clay-decomposition technique.

Journal

  • Polymer

    Polymer 96 94-103, 2016-07

    Elsevier BV

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