Dynamics of associating polymers in solution: Dynamic light scattering and dynamic viscoelasticity of poly(vinyl alcohol) in aqueous borax solution

Akihiko Takada, N. Nemoto

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Abstract

We have studied the dynamics of poly(vinyl alcohol) (PVA) in aqueous borax solution by dynamic light scattering (DLS) and dynamic viscoelastic (DVE) measurements. DLS measurement showed the presence of two dominant modes with decaying rates of Γf and Γsf > Γs). Different dynamical behaviors were observed above and below a critical concentration, CN. The slow mode was manifested to be the diffusive mode for PVA concentration C < CN and the relaxation mode for C > CN. Dynamical correlation length, ξH, estimated from Γf exhibited a jump at CN with increasing C. Detailed analysis revealed the applicability of the dynamic scaling theory to Γs for C < CN and the presence of the dynamic coupling between concentration fluctuation and elastic stress of the transient network for C > CN. From these results, we drew the picture on a growing process of associating PVA chains to a temporally cross-linked network with increasing C and proposed that CN corresponded to the gel point of the chemically cross-linked gel in the short-time domain. The concept is found to be useful for interpretation of the concentration dependence of the plateau modulus.

Original languageEnglish
Pages (from-to)183-187
Number of pages5
JournalProgress in Colloid and Polymer Science
Volume106
DOIs
Publication statusPublished - Jan 1 1997

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Sodium borate
viscoelasticity
Viscoelasticity
Dynamic light scattering
Polymers
alcohols
Alcohols
light scattering
aqueous solutions
polymers
Gels
gels
plateaus
borax
scaling

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

Cite this

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abstract = "We have studied the dynamics of poly(vinyl alcohol) (PVA) in aqueous borax solution by dynamic light scattering (DLS) and dynamic viscoelastic (DVE) measurements. DLS measurement showed the presence of two dominant modes with decaying rates of Γf and Γs (Γf > Γs). Different dynamical behaviors were observed above and below a critical concentration, CN. The slow mode was manifested to be the diffusive mode for PVA concentration C < CN and the relaxation mode for C > CN. Dynamical correlation length, ξH, estimated from Γf exhibited a jump at CN with increasing C. Detailed analysis revealed the applicability of the dynamic scaling theory to Γs for C < CN and the presence of the dynamic coupling between concentration fluctuation and elastic stress of the transient network for C > CN. From these results, we drew the picture on a growing process of associating PVA chains to a temporally cross-linked network with increasing C and proposed that CN corresponded to the gel point of the chemically cross-linked gel in the short-time domain. The concept is found to be useful for interpretation of the concentration dependence of the plateau modulus.",
author = "Akihiko Takada and N. Nemoto",
year = "1997",
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T2 - Dynamic light scattering and dynamic viscoelasticity of poly(vinyl alcohol) in aqueous borax solution

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N2 - We have studied the dynamics of poly(vinyl alcohol) (PVA) in aqueous borax solution by dynamic light scattering (DLS) and dynamic viscoelastic (DVE) measurements. DLS measurement showed the presence of two dominant modes with decaying rates of Γf and Γs (Γf > Γs). Different dynamical behaviors were observed above and below a critical concentration, CN. The slow mode was manifested to be the diffusive mode for PVA concentration C < CN and the relaxation mode for C > CN. Dynamical correlation length, ξH, estimated from Γf exhibited a jump at CN with increasing C. Detailed analysis revealed the applicability of the dynamic scaling theory to Γs for C < CN and the presence of the dynamic coupling between concentration fluctuation and elastic stress of the transient network for C > CN. From these results, we drew the picture on a growing process of associating PVA chains to a temporally cross-linked network with increasing C and proposed that CN corresponded to the gel point of the chemically cross-linked gel in the short-time domain. The concept is found to be useful for interpretation of the concentration dependence of the plateau modulus.

AB - We have studied the dynamics of poly(vinyl alcohol) (PVA) in aqueous borax solution by dynamic light scattering (DLS) and dynamic viscoelastic (DVE) measurements. DLS measurement showed the presence of two dominant modes with decaying rates of Γf and Γs (Γf > Γs). Different dynamical behaviors were observed above and below a critical concentration, CN. The slow mode was manifested to be the diffusive mode for PVA concentration C < CN and the relaxation mode for C > CN. Dynamical correlation length, ξH, estimated from Γf exhibited a jump at CN with increasing C. Detailed analysis revealed the applicability of the dynamic scaling theory to Γs for C < CN and the presence of the dynamic coupling between concentration fluctuation and elastic stress of the transient network for C > CN. From these results, we drew the picture on a growing process of associating PVA chains to a temporally cross-linked network with increasing C and proposed that CN corresponded to the gel point of the chemically cross-linked gel in the short-time domain. The concept is found to be useful for interpretation of the concentration dependence of the plateau modulus.

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