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Main Title: Short- and Long-Range Mechanical and Chemical Interphases Caused by Interaction of Boehmite (γ-AlOOH) with Anhydride-Cured Epoxy Resins
Author(s): Ghasem Zadeh Khorasani, Media
Elert, Anna-Maria
Hodoroaba, Vasile-Dan
Agudo Jácome, Leonardo
Altmann, Korinna
Silbernagl, Dorothee
Sturm, Heinz
Type: Article
Language Code: en
Abstract: 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.
Issue Date: 4-Jun-2019
Date Available: 20-Aug-2019
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): epoxy nanocomposites
intermodulation AFM
atomic force microscopy
Sponsor/Funder: DFG, 232311024, FOR 2021: Wirkprinzipien nanoskaliger Matrixadditive für den Faserverbundleichtbau
Journal Title: Nanomaterials
Publisher: MDPI
Publisher Place: Basel
Volume: 9
Issue: 6
Article Number: 853
Publisher DOI: 10.3390/nano9060853
EISSN: 2079-4991
Appears in Collections:FG Tribologie » Publications
FG Polymertechnik und Polymerphysik » Publications

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