Synthesis and Mechanical Properties of a Nanocomposite Gel Consisting of a Tetra-PEG/Clay Network

DOI Web Site 8 Citations
  • Mieko Fukasawa
    Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan
  • Takamasa Sakai
    Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • Ung-il Chung
    Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • Kazutoshi Haraguchi
    Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan

Bibliographic Information

Published
2010-04-15
DOI
  • 10.1021/ma100419c
Publisher
American Chemical Society (ACS)

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Description

Tetra-poly(ethylene glycol) (PEG)-based nanocomposite hydrogels (tP-NC gels) were prepared by in situ polymerization of two kinds of macromonomer (TN-PEG and TA-PEG), each having four reactive PEG arms, in the presence of clay (Laponite XLG) in aqueous media. By adopting appropriate synthetic conditions such as the use of pyrophosphate-Na buffer and selected homogeneous mixing procedures, tP-NC gels with high transparency and excellent tensile properties, e.g., high elongation (900−1000%) and high tensile strength (300−560 kPa), approximately 2−4 times those of the corresponding original tetra-PEG gel, were obtained at a relatively low clay concentration (Cclay = 2 × 10−2 mol/L-H2O) and a wide range of polymer concentrations (Cp = 120−240 mg/mL-H2O). We investigated the effects of buffer, Cclay, and Cp on forming tetra-PEG/clay gels, their tensile properties, and the network structures. Also, we studied interactions between the clay and tetra-PEG segments, by measurements such as viscometry, X-ray fluores...

Journal

  • Macromolecules

    Macromolecules 43 (9), 4370-4378, 2010-04-15

    American Chemical Society (ACS)

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