Electro-optical properties of carboxymethylcellulose. I. Concentration and ionic strength dependence

✍ Scribed by M. Hanss; B. Roux; J. C. Bernengo; M. Milas; M. Rinaudo

• Book ID: 102761451
• Publisher: Wiley (John Wiley & Sons)
• Year: 1973
• Tongue: English
• Weight: 627 KB
• Volume: 12
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1973.360120805

✦ Synopsis

Abstract

The experimental conditions for studying the electro‐optical properties of a natural, modified polyelectrolyte, carboxymethylcellulose (DS 1.3; DP 180) were determined. The transient Kerr effect was found to be a function of CMC concentration, field strength, and ionic strength, I. If the concentration and I were low enough (c < 20 mg.l^−1^), saturation was obtained for field strengths of approximately 15 kV.cm^−1^. The optical anisotropy was shown to be independent of I; the electrical anisotropy decreased sharply when I increased. These results are discussed in connection with polarization theories of polyelectrolytes. The molecular dimensions of carboxymethylcellulose, calculated from the birefringence kinetics, suggest that the molecule is a rigid rod.