Abstract
Poly(ethylene terephthalate) (PET) films have been exposed to uvradiation. Electrical property changes which occur in the films were examined. It was found that the relative dielectric constant and the dielectric strength decrease, while the dielectric loss factor increases. The rate of change of these parameters slowed down as the irradiation time increased. The parameter changes are presented graphically as a function of irradiation time and empirical equations are established. These empirical equations were obtained as second or third order polynomials by the least squares analysis method. The method of function straightening gave simpler power or exponential functions. These empirical equations represent the relationships between the electrical parameters and the irradiation time to a limit of relative error of less than 10%.
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