This study investigates the dielectric response and molecular mobility of amorphous polyvinyl butyral (PVB) films through a novel application of a fractional dielectric model. Using dynamic dielectric analysis (DEA) in a frequency range from \(10^2\) to \(10^6\) Hz and a temperature range from 293 to 393 K, the effect of molecular weight on the dielectric retardation times and the \(\alpha\) -relaxation behavior of PVB was analyzed. Three PVB samples of varying molecular weights were examined, and the results were modeled using an Electric Fractional Model (EFM), derived from a modified Debye model with two cap-resistors. This model allowed for an accurate prediction of the retardation time distribution spectrum, providing insights into the relationship between molecular mobility and molecular weight. The results demonstrate that higher molecular weight is correlated with broader retardation time distributions, offering potential for advanced applications in polymer dielectric design.
