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

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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.
Description
Keywords
Rheometry, Glass-forming liquids, Instrument compliance, Measurement repeatability
Other note
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