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Dynamic Light Scattering and Dynamic Viscoelasticity of Poly(vinyl alcohol) in Aqueous Borax Solutions. 4. Further Investigation on Polymer Concentration and Molecular Weight Dependencies
- Source :
- Macromolecules. 31:436-443
- Publication Year :
- 1998
- Publisher :
- American Chemical Society (ACS), 1998.
-
Abstract
- 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 ...
- Subjects :
- chemistry.chemical_classification
Vinyl alcohol
Aqueous solution
Polymers and Plastics
Borax
Organic Chemistry
Thermodynamics
Polymer
Viscoelasticity
Inorganic Chemistry
chemistry.chemical_compound
Viscosity
chemistry
Dynamic light scattering
Inflection point
Polymer chemistry
Materials Chemistry
Subjects
Details
- ISSN :
- 15205835 and 00249297
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Macromolecules
- Accession number :
- edsair.doi...........9df1bf3ba627f6f7a6908977a0e08380