Small-diameter parallel plate rheometry: a simple technique for measuring rheological properties of glass-forming liquids in shear

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openAccess

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Journal Title

Journal ISSN

Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2017

Major/Subject

Mcode

Degree programme

Language

en

Pages

661–671

Series

Rheologica Acta, Volume 56, issue 7–8

Abstract

The rheological characterization of glass-forming liquids is challenging due to their extreme temperature dependence and high stiffness at low temperatures. This study focuses on the special precautions that need to be taken to accommodate high sample stiffness and torsional instrument compliance in shear rheological experiments. The measurement errors due to the instrument compliance can be avoided by employing small-diameter parallel plate (SDPP) rheometry in combination of numerical instrument compliance corrections. Measurements of that type demonstrate that accurate and reliable rheological data can be obtained by SDPP rheometry despite unusually small diameter-to-gap (d/h) ratios. Specimen preparation for SDPP requires special attention, but then experiments show excellent repeatability. Advantages and some current applications of SDPP rheometry are briefly reviewed. SDPP rheometry is seen as a simple and versatile way to measure rheological properties of glass-forming liquids especially near their glass transition temperature.

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Keywords

Rheometry, Glass-forming liquids, Instrument compliance, Measurement repeatability

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Citation

Laukkanen, O-V 2017, ' Small-diameter parallel plate rheometry: a simple technique for measuring rheological properties of glass-forming liquids in shear ', Rheologica Acta, vol. 56, no. 7–8, pp. 661–671 . https://doi.org/10.1007/s00397-017-1020-5