Structural Transition of Non-ionic Poly(acrylamide) Gel

  • Sada-atsu Mukai
  • Hirohisa Miki
  • Vasyl Garamus
  • Regine Willmeit
  • Masayuki TokitaEmail author
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 136)


We discuss the structure of the opaque poly(acrylamide) gel that is synthesized at higher mole fractions of the cross-linking agent above 0.2. The structure of the opaque gel is analyzed by the small angle neutron scattering technique. The fractal analysis of the scattering function yields that the polymer network of the opaque poly(acrylamide) gel can be seen as a mass fractal of the fractal dimension of about DM ∼ 2.7 when the mole fraction of the cross-linker is higher than 0.3. On the other hand, much larger exponents are obtained in the lower concentration region of the cross-linker less than 0.3. It suggests that the polymer network of the gel behaves as a surface fractal of the fractal dimension of DS ∼ 2.5. The structure of the polymer network changes from the surface fractal to the mass fractal at the mole fraction of the cross-linker is 0.3 when the mole fraction of the cross-linker is increased from 0.2 to 0.5. The structure of the gel is also observed by using the confocal laser scanning microscope. The fractal analysis of the confocal images indicate that the fractal dimension of the two dimensional distribution of the colloidal particles in the cross section of the colloidal aggregate is found to be about 1.7.


Mole Fraction Fractal Dimension Confocal Laser Scanning Microscope Colloidal Particle Polymer Network 
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  1. 1.
    Richards EG and Temple CJ (1971) Nature 220:92Google Scholar
  2. 2.
    Bansil Rand Gupta MK (1980) Ferroelectrics 30:63CrossRefGoogle Scholar
  3. 3.
    Asnaghi D Giglio M Bossi A and Righetti PG (1997) Macromolecules 30:6194CrossRefGoogle Scholar
  4. 4.
    Benguigui L and Boue F (1999) Eur. Phys. J. B11:439Google Scholar
  5. 5.
    Doi Y and Tokita M (2005) Langmuir 21:5285CrossRefGoogle Scholar
  6. 6.
    Doi Y and Tokita M (2005) Langmuir 21:9420CrossRefGoogle Scholar
  7. 7.
    Mandelbrot BB (1997) The Fractal Geometry of Nature. W. H. Freeman and Company, New YorkGoogle Scholar
  8. 8.
    Schmidt PW (1995) Modern Aspects of Small-Angle Scattering. Bumberger H, Eds., Kluwer Academic Publishers, Netherlands. pp. 1–56CrossRefGoogle Scholar
  9. 9.
    See for instance, The theory of Rare Processes, The Kinetics of Chemical Reactions, Viscosity, Diffusion and Electrochemical Phenomena. Glasstone S, Laidler KJ and Eyring H, McGRAW-HILL, Inc., New York and London, 1964Google Scholar
  10. 10.
    Nakamura T (1998) Doctoral Thesis, Mie UniversityGoogle Scholar
  11. 11.
    Flory PJ (1953) Principles of Polymer Chemistry. Cornell University Press, Ithaca and London, Chapter 5Google Scholar
  12. 12.
    Ziff RM (1980) J. Stat. Phys., 23:241CrossRefGoogle Scholar
  13. 13.
    Ziff RM and Stell G (1980) J. Chem. Phys. 73:3492CrossRefGoogle Scholar
  14. 14.
    Weitz DA and Huang JS (1984) Kinetics of Aggregation and Gelation F, Family and DP Landau, Eds., Elsevier Science Publishers B.V., p. 19Google Scholar
  15. 15.
    Witten TA and Sander LM (1981) Phys. Rev. Lett. 47:1400CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Sada-atsu Mukai
  • Hirohisa Miki
  • Vasyl Garamus
    • 2
  • Regine Willmeit
    • 2
  • Masayuki Tokita
    • 1
    Email author
  1. 1.Department of Physics, Faculty of ScienceKyushu UniversityFukuokaJapan
  2. 2.Department of Macromolecular Structure Research Institute for Material ResearchGKSS Research CenterGeesthachtGermany

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