On merging DMA and microindentation to determine local mechanical properties of polymers

Micro- and nanoindentation and Dynamic Mechanical Analysis (DMA) are different methods to determine mechanical and viscoelastic material properties. The aim of this study was to broaden the capabilities of their utilization by merging these methods. Three standard diamond indenters and a tungsten ne...

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Bibliographic Details
Published in:Polymer testing 2018-07, Vol.68, p.359-364
Main Authors: Ramakers-van Dorp, Esther, Haenel, Thomas, Sturm, Frank, Möginger, Bernhard, Hausnerova, Berenika
Format: Article
Language:English
Subjects:
Complex modulus
Diamond pyramid hardness
Diamonds
Dynamic mechanical analysis
Indenters
Local mechanical properties
Material properties
Mechanical properties
Microhardness
Microindentation
Nanoindentation
Polymers
Static stiffness
Stiffness
Tungsten
Viscoelasticity
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Summary:Micro- and nanoindentation and Dynamic Mechanical Analysis (DMA) are different methods to determine mechanical and viscoelastic material properties. The aim of this study was to broaden the capabilities of their utilization by merging these methods. Three standard diamond indenters and a tungsten needle were implemented in a conventional DMA. Four types of standard polymers were investigated. Quasi-static microindentation was performed to determine local material static stiffness, and dynamic microindentation was performed to evaluate local material complex modulus. The results of the quasi-static microindentation showed that different static stiffnesses of the polymers can be distinguished. Even the smallest differences in local mechanical properties due to processing and annealing were distinguished. The complex moduli determined by dynamic microindentation were in good agreement with literature values and three-point bending results. It was shown that a conventional DMA is suitable to determine local and bulk mechanical viscoelastic material properties within one instrument. •Capability of microindentation and DMA broaden by merging these methods.•Standard diamond indenters and tungsten needle implemented in a conventional DMA.•Quasi-static microindentation can distinguish between polymers and processing.•Complex moduli determined by dynamic microindentation are in a good agreement with literature.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2018.04.020