Dynamics in Concentrated Solutions of Poly(methyl methacrylate)/Bis(2-ethylhexyl phthalate)

Abstract

Photon correlation spectroscopy (PCS) and dielectric spectroscopy (DS) are employed to study the dynamics of density fluctuations at temperatures above and below the T g and the dynamics of concentration fluctuations above T g in concentrated solutions of poly(methylmethacrylate)/bis(2-ethylhexyl phthalate) (PMMA/DOP). The PCS measurements covered the temperature range between 252 and 313 K, and the DS measurements were made between 200 and 398 K and in the frequency range between 10 -2 and 10 5 Hz. Above T g the polarized PCS correlation functions contain contributions from both density and concentration fluctuations for a range of temperatures