Abstract
A surprising slow down in the dielectric secondaryγ-relaxation with temperature increasing near the glass transition is confirmed forseveral polypropylene glycols. The peculiar behavior diminishes as the molecularweight grows. The minimal model (Dyre and Olsen 2003 Phys. Rev. Lett. 91155703) is applied successfully to describe the temperature dependences of theγ-relaxation times. The minimal model parameters are analyzedfor different molecular weights. A molecular explanation of theγ-process anomaly for polypropylene glycols is proposed on the basis of the minimal modelprediction.
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