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Short- and Long-Range Mechanical and Chemical Interphases Caused by Interaction of Boehmite (γ-AlOOH) with Anhydride-Cured Epoxy Resins

1
Bundesanstalt für Materialforschung und -prüfung (BAM), D-12205 Berlin, Germany
2
Department of Polymer Materials and Technology, Technical University Berlin, D-10587 Berlin, Germany
3
Department of Mechanical Engineering and Transport Systems, Technical University Berlin, D-10587 Berlin, Germany
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(6), 853; https://doi.org/10.3390/nano9060853
Received: 12 May 2019 / Revised: 28 May 2019 / Accepted: 29 May 2019 / Published: 4 June 2019
Understanding the interaction between boehmite and epoxy and the formation of their interphases with different mechanical and chemical structures is crucial to predict and optimize the properties of epoxy-boehmite nanocomposites. Probing the interfacial properties with atomic force microscopy (AFM)-based methods, especially particle-matrix long-range interactions, is challenging. This is due to size limitations of various analytical methods in resolving nanoparticles and their interphases, the overlap of interphases, and the effect of buried particles that prevent the accurate interphase property measurement. Here, we develop a layered model system in which the epoxy is cured in contact with a thin layer of hydrothermally synthesized boehmite. Different microscopy methods are employed to evaluate the interfacial properties. With intermodulation atomic force microscopy (ImAFM) and amplitude dependence force spectroscopy (ADFS), which contain information about stiffness, electrostatic, and van der Waals forces, a soft interphase was detected between the epoxy and boehmite. Surface potential maps obtained by scanning Kelvin probe microscopy (SKPM) revealed another interphase about one order of magnitude larger than the mechanical interphase. The AFM-infrared spectroscopy (AFM-IR) technique reveals that the soft interphase consists of unreacted curing agent. The long-range electrical interphase is attributed to the chemical alteration of the bulk epoxy and the formation of new absorption bands. View Full-Text
Keywords: epoxy nanocomposites; boehmite; interphase; Intermodulation AFM; SKPM; AFM-IR epoxy nanocomposites; boehmite; interphase; Intermodulation AFM; SKPM; AFM-IR
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Ghasem Zadeh Khorasani, M.; Elert, A.-M.; Hodoroaba, V.-D.; Agudo Jácome, L.; Altmann, K.; Silbernagl, D.; Sturm, H. Short- and Long-Range Mechanical and Chemical Interphases Caused by Interaction of Boehmite (γ-AlOOH) with Anhydride-Cured Epoxy Resins. Nanomaterials 2019, 9, 853.

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