Viscosity dependence of the local segmental dynamics of anthracene-labeled polystyrene in dilute solution

TitleViscosity dependence of the local segmental dynamics of anthracene-labeled polystyrene in dilute solution
Publication TypeJournal Article
Year of Publication1991
AuthorsWaldow, Dean, Ediger M. D., Yamaguchi Yoshikazu, Matsushita Yushu, and Noda Ichiro
JournalMacromolecules
Volume24
Issue11
Pagination3147-53
AbstractThe local segmental dynamics of anthracene-labeled polystyrene in dil. soln. was studied using time-correlated single-photon counting. Six solvents covering 2 decades in viscosity (.eta.) were utilized. Correlation times were extd. from the orientation autocorrelation functions and detd. as a function of temp. in all solvents. Under good solvent conditions, the correlation time is proportional to .eta.0.9 at const. temp., in reasonable agreement with the .eta.1.0 prediction of the Kramers' equation in the high-friction limit. Other aspects of the results are also reasonably consistent with the assumption that the solvent acts as a continuum. Somewhat slower dynamics are obsd. in .THETA. solvents than in good solvents. The potential barrier height for local dynamics extd. from these measurements is .+-. 3 kJ/mol.