EFFECT OF DILUENT ON MOLECULAR-MOTION AND GLASS-TRANSITION IN POLYMERS .4. SYSTEM POLY(METHYL ACRYLATE) TOLUENE

The influences of diluent on molecular motions and glass transition were studied on the system poly(methyl acrylate)—toluene by means of dielectric and thermal measurements over a wide concentration range. Three relaxation processes assigned respectively to the segmental motion of the polymer chain, rotation of the side group, and local motion were recognized between 80 and 300K with decreasing temperature. Two step-wise changes in DTA diagram were observed and can be assigned as glass transition points TgI and TgII. The magnitude of dielectric dispersion, activation plot, and glass transition temperature are discussed by comparing them with those of systems reported previously. Coalescence of the primary and secondary loss peaks was observed and are explained in terms of the correlation functions for motion of the dipole. © 1979, The Society of Polymer Science, Japan. All rights reserved.