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Rheologica Acta

, Volume 57, Issue 11, pp 757–770 | Cite as

High sensitivity measurements of normal force under large amplitude oscillatory shear

  • Ingo F. C. Naue
  • Roland Kádár
  • M. Wilhelm
Original Contribution
  • 55 Downloads

Abstract

The two aims of this publication are to introduce a new and rheometer-independent rheometric tool for measuring the axial normal force in oscillatory shear rheology and to study the normal forces of polyolefin melts under large amplitude oscillatory shear (LAOS). A new plate geometry with an incorporated highly sensitive piezoelectric normal force sensor was designed for a rotational rheometer. The new geometry was used to investigate normal forces of polyethylene (PE) melts under LAOS. The resulting stress and normal force data was compared with the data from measurements in commercial high performance rotational rheometers. The stress and the normal force response were Fourier-transformed and their resulting spectra were analysed. The non-linear contributions to the FT-magnitude spectra (i.e. the intensities of the higher harmonics) were analysed using the framework of the Q-parameter, \(Q=I_{3/1}/{\gamma ^{2}_{0}}\) for both the stress spectrum and the normal force spectrum, resulting in the strain-dependent \(Q\left (\gamma _{0}\right )\) and \(Q_{NF}\left (\gamma _{0}\right )\), respectively. The newly designed normal force geometry had a sensitivity in the measurement starting from \(5\times 10^{-5}\) N up to 20 N, and respectively a signal-to-noise ratio (SNR) of \(1:\) 16.000, which is about a factor of 1.8 times better than the best performing commercial rheometers. The new geometry was used to determine \(Q\left (\gamma _{0}\right )\) and \(Q_{NF}\left (\gamma _{0}\right )\), to characterize the shear rheological behaviour of the PE melts. Even rather simple rheometers, those without normal force detection, can be extended utilizing the here presented tools for high sensitive FT-rheology analysing the normal forces.

Keywords

Normal force Rotational rheometer Polyethylene Polymer melts Large amplitude oscillatory shear (LAOS) Rheometer 

Notes

Acknowledgments

The authors want to thank Dr. C.O. Klein for his preliminary work with the CaBER, see Klein et al. (2009) and D. Zimmermann for his support at the ARES measurements. Furthermore, the authors want to thank, Dr. I. Vittorias from LyondellBASELL, Dr. S.A. Filipe from Borealis and Prof. H. Münstedt for providing some of the samples. The authors are grateful to Dr. D. Merger, Dr. M. Abbasi and, especially, Dr. J. Kübel for proofreading the manuscript.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Karlsruhe Institute of Technology - KITKarlsruheGermany
  2. 2.Department of Industrial and Materials ScienceChalmers University of TechnologyGothenburgSweden

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