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Soft Matter and Biological Physics

Eur. Phys. J. E 1, 195-202

Electric field light scattering by flexible linear polyelectrolytes in aqueous solution

R.A. Deike - C. Martin - R. Weber

Fakultät für Physik, Universität Konstanz, 78434 Konstanz, Germany
Reinhart.Weber@uni-konstanz.de

Received 9 April 1999 and Received in final form 18 August 1999

Abstract
Electric field light scattering results on aqueous solutions of linear, flexible NaPSS at minimal ionic strength are reported. Samples of molecular weights between 356 kg/mol and 2870 kg/mol were investigated. With increasing field strength the intensity as a function of wavenumber develops a pronounced oscillating behaviour. Besides the well-known first peak a second maximum is observed at the position at which a weak maximum for some samples already occurs at zero field. The overall intensity strongly depends on the frequency of the electric field. The electro-optical effect shows a maximum at 300 kHz. Increasing the particle concentration gives a large increase of the peak maximum, normalized to concentration. If plotted versus scattering angle the relative intensity increase is maximum for samples of medium molecular weight. The results strongly indicate a stretching and alignment of the chains, thus leading to or enlarging the short range order of the chains.

PACS
61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling - 78.35.+c Brillouin and Rayleigh scattering; other light scattering - 82.70.Kj Emulsions and suspensions

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