Ultrastiff, Thermoresponsive Nanocomposite Hydrogels Composed of Ternary Polymer–Clay–Silica Networks

DOI Web Site 6 Citations 52 References
  • Huan-Jun Li
    School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Kazutoshi Haraguchi
    Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, 1-2-1 Izumi, Narashino, Chiba 275-8575, Japan
  • Haoyang Jiang
    School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China

Bibliographic Information

Published
2018-01-11
Resource Type
journal article
DOI
  • 10.1021/acs.macromol.7b02305
Publisher
American Chemical Society (ACS)

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Description

Anomalous increases in mechanical stiffness and tensile strength were achieved in a poly(N-isopropylacrylamide) nanocomposite gel (NC gel) by incorporating a small amount of silica through the sol–gel reaction of tetraethyl orthosilicate in the polymer–clay network. The resulting NC-Si gels, with ternary polymer–clay–silica structures, exhibited very high tensile moduli (∼3500 kPa) and strengths (∼1700 kPa), as well as well-defined thermoresponsive swelling/deswelling behavior, through the incorporation of 0.2–2.5 wt % silica (relative to the gel weight). The reinforcing efficiency of in situ formed silica in the NC gel is more than 50 times that of clay, while the incorporation of preformed silica nanoparticles led to no observable changes in mechanical properties. The controllable range of hydrogel tensile mechanical properties was significantly extended by the preparation of NC-Si gels. The ternary polymer–clay–silica network structure was proposed on the basis of optical transmittance, TEM, EDS, and 2...

Journal

  • Macromolecules

    Macromolecules 51 (2), 529-539, 2018-01-11

    American Chemical Society (ACS)

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