Dielectric a-relaxation of a bisphenol-A type epoxide oligomer has been investigated in the vicinity of the glass transition temperature (T,) by the direct current (DC) transient method. The logarithm of the DC transient current for the oligomer was well approximated by the third order function of the logarithm of time. The complex dielectric constant was calculated through the Fourier transformation of that approximation function according to Simpson's integration rule in a frequency range of -1 Hz. At the t…
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