Dynamic light scattering and dynamic viscoelasticity of poly (vinyl alcohol) in aqueous borax solutions. 4. Further investigation on polymer concentration and molecular weight dependencies

Akihiko Takada, Miki Nishimura, Akihiro Koike, Norio Nemoto

研究成果: Contribution to journalArticle査読

31 被引用数 (Scopus)

抄録

Viscosity measurements are made on aqueous borax solutions of poly(vinyl alcohol) (PVA) samples over a wide range of PVA concentration, C, to examine the hydrodynamic properties of associated polymers compared to those of neutral polymers. The dynamic viscoelastic data are reanalyzed using a statistical-mechanical theory for elastically effective chains in transient gels developed by Tanaka and Ishida. The viscosity data are not superposed in the plot of viscosity against C[η] using the Huggins relationship, especially around and over a critical concentration, CN, at which the dynamical behaviors drastically change and an inflection point of a curve in the plot of the viscosity against C is located. On the other hand, when we assume that the chain dimension around CN is the unperturbed one, the viscosity data around CN is well-superposed on a curve in the plot of viscosity against C/C*up, where C*up is the overlapping concentration of the unperturbed chain. The inflection point of this composite curve is located at C/C*up = 1, which infers that CN corresponds to the overlapping concentration. All data of the density of elastically effective chains, νeff, are superposed on a curve in the plot of νefflν against (C - CN)/CN where ν is the density of polymer chains, which implies that CN should be regarded as a kind of gel point. Some discrepancies between the experimental data and the theoretical curve were observed, some of which cannot be explained using the pairwise association of PVA chains.

本文言語英語
ページ(範囲)436-443
ページ数8
ジャーナルMacromolecules
31
2
DOI
出版ステータス出版済み - 1 27 1998

All Science Journal Classification (ASJC) codes

  • 有機化学
  • ポリマーおよびプラスチック
  • 無機化学
  • 材料化学

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