Abstract
The dielectric studies of six kinds of vinylidene chloride copolymers (VC-VD copolymers) were studied over the wide range of frequency and temperature.
For the samples I, II and III, we observed one dispersion and for the samples IV, V and VI, we observed two kinds of dispersions. The higher-frequency dispersion (β-dispersions) which appeared in the case of IV, V and VI could not be observed in the polymer containing vinylidene chloride more than 70%, that is, in the case of I, II and III.
The variation of the magnitude of the α-dispersion which is related to the glass transition has been investigated.
From the dielectric point of view the glass transition temperature is lowered with increasing content of vinylidene chloride.
The values of Cole's parameter α for the vinylidene chloride and vinyl chloride copolymer decreased with increasing temperature and increasing vinylidene chloride content.
From the temperature dependence of dielectric dispersion, the activation energy for orientation of dipole for samples I, II, III, IV, V and VI, were calculated to be 34, 35, 40, 46, 64 and 92kcal/mole, respectively.
The activation energy decreased with increasing content of vinylidene chloride.
