Gelation Mechanism of Poly(<i>N</i>-isopropylacrylamide)−Clay Nanocomposite Gels

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  • Sho Miyazaki
    Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan; CREST, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan; and Kawamura Institute of Chemical Research, 631 Sakada, Sakura-shi, Chiba 285-0078, Japan
  • Takeshi Karino
    Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan; CREST, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan; and Kawamura Institute of Chemical Research, 631 Sakada, Sakura-shi, Chiba 285-0078, Japan
  • Hitoshi Endo
    Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan; CREST, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan; and Kawamura Institute of Chemical Research, 631 Sakada, Sakura-shi, Chiba 285-0078, Japan
  • Mitsuhiro Shibayama
    Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan; CREST, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan; and Kawamura Institute of Chemical Research, 631 Sakada, Sakura-shi, Chiba 285-0078, Japan
  • Kazutoshi Haraguchi
    Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan; CREST, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan; and Kawamura Institute of Chemical Research, 631 Sakada, Sakura-shi, Chiba 285-0078, Japan

Bibliographic Information

Published
2007-05-08
DOI
  • 10.1021/ma070104v
Publisher
American Chemical Society (ACS)

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Description

The gelation mechanism of poly(N-isopropylacrylamide)−clay nanocomposite gels (NC gel) was investigated by dynamic light scattering (DLS) and contrast variation small-angle neutron scattering (SANS). It was found that the gelation mechanism of NC gels is similar to that of conventional gels made with organic cross-linker (OR gels). Namely, time-resolved DLS measurements captured all of the characteristic features of gelation at the threshold. This indicates that the gelation of NC gels is also classified to an ergode−nonergode transition. However, the size of the clusters at the gelation threshold is much larger than that of OR gels. This results in a significant depression of optical transmittance exclusively at the gelation threshold for NC gels. Partial scattering functions, i.e., two self-terms SPP(q) and SCC(q) and the corresponding cross-term SCP(q), were obtained by contrast-variation SANS, where P and C denote polymer and clay, respectively, and q is the magnitude of the scattering vector. The det...

Journal

  • Macromolecules

    Macromolecules 40 (12), 4287-4295, 2007-05-08

    American Chemical Society (ACS)

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