Glassy dynamics in mono-, di-, and tri-propylene glycol: From the alpha- to the fast beta-relaxation

TL;DR

This study provides a comprehensive broadband dielectric spectroscopy analysis of mono-, di-, and tri-propylene glycol, revealing detailed glassy dynamics including alpha and beta relaxation processes across a wide frequency range.

Contribution

It offers the first broadband spectra covering the fast beta-process for these three propylene glycols, expanding the understanding of molecular glass formers.

Findings

Detailed characterization of alpha and beta relaxations.

First broadband spectra including fast beta-process for these materials.

Enhanced understanding of glassy dynamics in propylene glycols.

Abstract

We present a thorough characterization of the glassy dynamics of three propylene glycols (mono-, di- and trimer) by broadband dielectric spectroscopy. By covering a frequency range of more than 15 decades, we have access to the entire variety of dynamic processes typical for glassy dynamics. These results add three more molecular glass formers to the sparse list of materials for which real broadband spectra, including the region of the fast beta-process, are available. Some first analyses of the various observed dynamic processes are provided.