Clay Concentration Dependence of Microstructure in Deformed Poly(<i>N</i>-isopropylacrylamide)−Clay Nanocomposite Gels

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  • 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
  • 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
  • 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
  • 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

Bibliographic Information

Published
2006-10-21
DOI
  • 10.1021/ma061688o
Publisher
American Chemical Society (ACS)

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Description

The microscopic structure of poly(N-isopropylacrylamide)−clay nanocomposite gels (NC gels) having various clay concentrations (Cclay) was investigated by mechanical measurement and small-angle neutron scattering (SANS) as a function of stretching ratio λ. The mechanical measurements indicated that the number of poly(N-isopropylacrylamide) (PNIPA) chains bridging clay platelets, Nchain, per unit volume increased with Cclay4/3. Two-dimensional SANS intensity patterns exhibited the so-called “abnormal-butterfly” pattern. However, both sector-averaged scattering intensities parallel and perpendicular to the stretching direction were well represented by Ornstein−Zernike (OZ) scattering functions, suggesting that the NC gels have very little cross-linking inhomogeneities regardless of Cclay and of λ (λ ≤ 2.0). The correlation length, ξ, obtained by the OZ functions was a decreasing function of Cclay, i.e., ξ ∼ Cclay-1/3, and was in proportion to the inter-platelet distance (∼Cclay-1/3). This suggests that the c...

Journal

  • Macromolecules

    Macromolecules 39 (23), 8112-8120, 2006-10-21

    American Chemical Society (ACS)

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