DYNAMICS OF THE BETA-PROCESS IN POLY(VINYL CHLORIDE)

The dielectric relaxation data of Ishida in the β-process region of poly(vinyl chloride) is represented in terms of the relaxation function proposed by Havriliak and Negami using the multiresponse techniques developed by Havriliak and Watts to evaluate the parameters and their dependence on temperature. These parameters are compared with those reported by the authors on the viscoelastic β process in poly(vinyl chloride). The three dynamic parameters and their dependence on temperature for the two processes are similar though not all of them are within their 95% confidence limits. The dynamics of the dielectric and viscoelastic β process in poly (vinyl chloride) and polycarbonate are compared. The mechanism for the β process is discussed in terms of the polymer segment orientation model (segment flips) proposed by the authors earlier, with the general model of Mansfield and the ring flip model for polycarbonate by Perchak et al. © 1990, American Chemical Society. All rights reserved.