SOLVENT ROTATIONAL MOBILITY IN 1,2-POLYBUTADIENE AROCLOR SOLUTIONS BYDIELECTRIC-RELAXATION AND FABRY-PEROT INTERFEROMETRY

The presence of poly(1,2-butadiene) in the solvent Aroclor enhances th e mean solvent rotational mobility relative to the neat solvent case e ven though the polymer has a higher glass transition temperature than that of the solvent. This interesting behavior found earlier by photon correlation spectroscopy is confirmed by dielectric relaxation and Fa bry-Perot interferometry. The new data extend significantly the freque ncy and temperature ranges of observation of the modification of the A roclor dynamics in solutions of poly(1,2-butadiene) and quantify the r ate at which the addition of the polymer alters the mean solvent reori entation time as a function of temperature.