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We present the experimental study of the primary, $\alpha$, and secondary,$\beta^*$, relaxations of the glassy polymer polyethylene naphthalate (PEN), byModulated Differential Scanning Calorimetry (MDSC), Thermally StimulatedDischarge Currents (TSDC) and Broadband Dielectric Spectroscopy (BDS). Resultsshow how the $\alpha$ and $\beta^*$ relaxations can be considered part of avery broad and distributed relaxation. The $\beta^*$ relaxation is composed ofa main contribution ($\beta_3^*$) and two additional ones ($\beta_1^*$ and$\beta_2^*$) and each elementary mode of the relaxation has its own glasstransition temperature. This scenario gives rise to an extended glasstransition mainly centered in $T_{g\beta^*} \sim 305$ K and $T_{g\alpha} \sim387$ K.

Double glass transition in polyethylene naphthalate structural relaxation by MDSC, BDS and TSDC