Shear-Induced Orientational Order in a Polystyrene/Benzene-d6 Solution As Observed by 2H NMR.
Using a home-built Couette-type shear cell we studied the behavior of a concentrated solution of polystyrene in benzene-d6 under shear. Deuterium NMR revealed a shear-dependent splitting of the benzene-d6 signal, indicating partial orientation of the polystyrene due to shear forces. Our preliminary results show a linear relationship between the order parameter Szz of the benzene molecule and the shear rate gamma for the interval 0 s-1 </= gamma < 400 s-1.
Center for Soft Condensed Matter, Department of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland, and Department of Physics, University of British Columbia, 6224 Agricultural Road, Vancouver, BC, V6T 1Z1 Canada.
ter Beek LC
FM
Linseisen