Concentration dependence of mechanical properties of polyacrylamide near the sol-gel transition point

Toshimasa Yano, Hitoshi Kumagai, Tomoyuki Fujii, Tetsuo Inukai

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The scaling law derived from the percolation theory was applied to the concentration dependence of mechanical properties of polyacrylamide measured near the sol–gel transition point. The critical concentration of the sol–gel transition, ϕg, was estimated from the plot of concentration (ϕ) vs. the reciprocal of viscosity (η) by extrapolating 1/η to zero. The critical exponent for the sol viscosity, s, which was estimated from the slope of the log(ϕg–ϕ) vs. log η plot was about 0.7. The estimated value of s was similar to the value predicted by the percolation theory based on the superconductor–normal conductor mixture model. The critical exponent for the gel elasticity, t, as estimated from the slope of the log(ϕ–ϕg) vs. log G′ plot, where G′ was the dynamic shear modulus of the gel at a frequency of 2Hz. The value of t was about 2, which was also similar to the value predicted by the percolation theory. These results indicated the at the concentration dependences of η and G′ of polyacrylamide near the sol–gel transition point were described by the percolation theory.

Original languageEnglish
Pages (from-to)528-531
Number of pages4
JournalBioscience, Biotechnology and Biochemistry
Volume57
Issue number4
DOIs
Publication statusPublished - 1993 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Organic Chemistry

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