Shear and dielectric responses of propylene carbonate, tripropylene glycol, and a mixture of two secondary amides

Catalin Gainaru, Tina Hecksher, Niels Boye Olsen, Roland Böhmer, Jeppe C. Dyre

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Propylene carbonate and a mixture of two secondary amides, N-methylformamide and N-ethylacetamide, are investigated by means of broadband dielectric and mechanical shear spectroscopy. The similarities between the rheological and the dielectric responses of these liquids and of the previously investigated tripropylene glycol are discussed within a simple approach that employs an electrical circuit for describing the frequency-dependent behavior of viscous materials. The circuit is equivalent to the Gemant-DiMarzio-Bishop model, but allows for a negative capacitive element. The circuit can be used to calculate the dielectric from the mechanical response and vice versa. Using a single parameter for a given system, good agreement between model calculations and experimental data is achieved for the entire relaxation spectra, including secondary relaxations and the Debye-like dielectric peak in the secondary amides. In addition, the predictions of the shoving model are confirmed for the investigated liquids.

Original languageEnglish
Article number064508
JournalJournal of Chemical Physics
Volume137
Issue number6
DOIs
StatePublished - Aug 14 2012
Externally publishedYes

Funding

We are indebted to Kristine Niss, Bo Jakobsen, and Robert Kahlau for useful discussions and constructive comments regarding the paper. Partial funding by the Deutsche Forschungsgemeinschaft via Grant No. Bo1301/8-1 is gratefully acknowledged. The centre for viscous liquid dynamics Glass and Time is sponsored by the Danish National Research Foundation (DNRF).

FundersFunder number
Deutsche Forschungsgemeinschaft100800169
Danmarks Grundforskningsfond

    Fingerprint

    Dive into the research topics of 'Shear and dielectric responses of propylene carbonate, tripropylene glycol, and a mixture of two secondary amides'. Together they form a unique fingerprint.

    Cite this