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Polymers 2019, 11(2), 235; https://doi.org/10.3390/polym11020235

Insights into Nano-Scale Physical and Mechanical Properties of Epoxy/Boehmite Nanocomposite Using Different AFM Modes

1
Bundesanstalt für Materialforschung und -prüfung (BAM), Div. 6.6, D-12205 Berlin, Germany
2
Department Polymertechnik/Polymerphysik, Technical University of Berlin, D-10587 Berlin, Germany
3
TU Wien, Institute of Sensor and Actuator Systems, A-1040 Vienna, Austria
4
Department Mechanical Engineering and Transport Systems, Technical University of Berlin, D-10587 Berlin, Germany
*
Author to whom correspondence should be addressed.
Received: 27 December 2018 / Revised: 28 January 2019 / Accepted: 29 January 2019 / Published: 1 February 2019
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Abstract

Understanding the interaction between nanoparticles and the matrix and the properties of interphase is crucial to predict the macroscopic properties of a nanocomposite system. Here, we investigate the interaction between boehmite nanoparticles (BNPs) and epoxy using different atomic force microscopy (AFM) approaches. We demonstrate benefits of using multifrequency intermodulation AFM (ImAFM) to obtain information about conservative, dissipative and van der Waals tip-surface forces and probing local properties of nanoparticles, matrix and the interphase. We utilize scanning kelvin probe microscopy (SKPM) to probe surface potential as a tool to visualize material contrast with a physical parameter, which is independent from the mechanics of the surface. Combining the information from ImAFM stiffness and SKPM surface potential results in a precise characterization of interfacial region, demonstrating that the interphase is softer than epoxy and boehmite nanoparticles. Further, we investigated the effect of boehmite nanoparticles on the bulk properties of epoxy matrix. ImAFM stiffness maps revealed the significant stiffening effect of boehmite nanoparticles on anhydride-cured epoxy matrix. The energy dissipation of epoxy matrix locally measured by ImAFM shows a considerable increase compared to that of neat epoxy. These measurements suggest a substantial alteration of epoxy structure induced by the presence of boehmite. View Full-Text
Keywords: nanomechanical properties; boehmite; epoxy nanocomposites; atomic force microscopy; intermodulation; interphase nanomechanical properties; boehmite; epoxy nanocomposites; atomic force microscopy; intermodulation; interphase
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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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Ghasem Zadeh Khorasani, M.; Silbernagl, D.; Platz, D.; Sturm, H. Insights into Nano-Scale Physical and Mechanical Properties of Epoxy/Boehmite Nanocomposite Using Different AFM Modes. Polymers 2019, 11, 235.

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