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
Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag
