Two-Dimensional Anisotropy Measurements Showing Local Heterogeneity in a Polymer Melt.
In polymers, the rotation of a small solute is nonexponential. Either heterogeneity in the local friction or local anisotropy-a homogeneous process-may be responsible. A new, two-dimensional anisotropy experiment is demonstrated on this problem. In poly(dimethylsiloxane), the rotation of individual solute molecules is found to be exponential, and the observed rate dispersion is primarily due to variation in the local friction. This sample is far from its glass transition. Studies of rate heterogeneity associated with the glass transition must account for the contribution from this polymer-related mechanism.
Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States.
Haorui
H
Wu
Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States.
Mark A
MA
Berg
MUPPETS; PDMS; multidimensional; polarization; reorientation