Apparent depth‐dependent modulus and hardness of polymers by nanoindentation: Investigation of surface detection error and pressure effects
| Autor: | Zhiyuan Qian, Gregory B. McKenna, Benjamin Stadnick, Jared Risan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Work (thermodynamics) Materials science Polymers and Plastics Modulus 02 engineering and technology Polymer Nanoindentation 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Stiffening chemistry.chemical_compound Natural rubber chemistry visual_art Materials Chemistry visual_art.visual_art_medium Polystyrene Physical and Theoretical Chemistry Composite material 0210 nano-technology Nanoscopic scale |
| Zdroj: | Journal of Polymer Science Part B: Polymer Physics. 56:414-428 |
| ISSN: | 1099-0488 0887-6266 |
| DOI: | 10.1002/polb.24554 |
| Popis: | Nanoindentation is a widely used technique to characterize the mechanical properties of polymeric materials at the nanoscale. Extreme surface stiffening has been reported for soft polymers such as poly(dimethylsiloxane) (PDMS) rubber. Our recent work [J. Polym. Sci. B Polym. Phys. 2017, 55, 30–38] provided a quantitative model which demonstrates such extreme stiffening can be associated with experimental artifacts, for example, error in surface detection. In this work, we have further investigated the effect of surface detection error on the determination of mechanical properties by varying the sample modulus, instrument surface detection criterion, and probe geometry. We have examined materials having Young's moduli from ∼2 MPa (PDMS) to 3 GPa (polystyrene) using two different nanoindentation instruments (G200 and TI 950) which implement different surface detection methods. The results show that surface detection error can lead to apparent large stiffening. The errors are lower for the stiffer materials, but can still be significant if care is not taken to establish the range of the surface detection error in a particular experimental situation. We have also examined the effect of pressure beneath the probe on the nanoindentation-determined modulus of polystyrene with different probe geometries. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017 |
| Databáze: | OpenAIRE |
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