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Development of an Advanced Dynamic Microindentation System to Determine Local Viscoelastic Properties of Polymers

1
Department of Natural Sciences, University of Applied Sciences Bonn-Rhein-Sieg, von Liebigstrasse 20, 53359 Rheinbach, Germany
2
Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
3
Netzsch Gerätebau GmbH, Wittelbachstrasse 42, D-95100 Selb, Germany
4
Centre of Polymer Systems, Tomas Bata University in Zlín, tr. T.Bati 5678, 760 01 Zlín, Czech Republic
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(5), 833; https://doi.org/10.3390/polym11050833
Received: 16 March 2019 / Revised: 26 April 2019 / Accepted: 5 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Mechanical Behavior of Polymers)
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Abstract

This study presents a microindentation system which allows spatially resolved local as well as bulk viscoelastic material information to be obtained within one instrument. The microindentation method was merged with dynamic mechanical analysis (DMA) for a tungsten cone indenter. Three tungsten cone indenters were investigated: tungsten electrode, tungsten electrode + 2% lanthanum, and tungsten electrode + rare earth elements. Only the tungsten electrode + 2% lanthanum indenter showed the sinusoidal response, and its geometry remained unaffected by the repeated indentations. Complex moduli obtained from dynamic microindentation for high-density polyethylene, polybutylene terephthalate, polycarbonate, and thermoplastic polyurethane are in agreement with the literature. Additionally, by implementing a specially developed x-y-stage, this study showed that dynamic microindentation with a tungsten cone indenter was an adequate method to determine spatially resolved local viscoelastic surface properties. View Full-Text
Keywords: dynamic indentation; dynamic mechanical analysis; tungsten cone indenter; complex modulus; spatial resolution dynamic indentation; dynamic mechanical analysis; tungsten cone indenter; complex modulus; spatial resolution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ramakers-van Dorp, E.; Haenel, T.; Ciongwa, D.; Möginger, B.; Hausnerova, B. Development of an Advanced Dynamic Microindentation System to Determine Local Viscoelastic Properties of Polymers. Polymers 2019, 11, 833.

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