INTERCONVERSION BETWEEN MECHANICAL AND DIELECTRIC RELAXATIONS FOR POLY(CYCLOHEXYL ACRYLATE)

Storage E' and loss E'' relaxation moduli are reported as functions of frequency for poly(cyclohexyl acrylate) (PCA) at several temperatures . The possibility that these results, in conjunction with the dipolar correlation coefficient, can be used to predict the frequency dependen ce of the real epsilon' and loss epsilon'' components of the complex d ielectric permittivity epsilon of PCA is studied. A relation between epsilon and the complex relaxation modulus E* is obtained by assuming that the lag of the rotating dipoles in the electric field is caused by both dielectric and mechanical friction. The values of epsilon obt ained from mechanical results by means of this expression are very clo se to those obtained from other relations based on the assumption that the lag of the dipoles is caused exclusively by mechanical friction.