Magnetite Core-Shell Nanoparticles in Nondestructive Flaw Detection of Polymeric Materials.
Nondestructive flaw detection in polymeric materials is important but difficult to achieve. In this research, the application of magnetite nanoparticles (MNPs) in nondestructive flaw detection is studied and realized, to the best of our knowledge, for the first time. Superparamagnetic and highly magnetic (up to 63 emu/g) magnetite core-shell nanoparticles are prepared by grafting bromo-end-group-functionalized poly(glycidyl methacrylate) (Br-PGMA) onto surface-modified Fe3O4NPs. These Fe3O4-PGMA NPs are blended into bisphenol A diglycidylether (BADGE)-based epoxy to form homogeneously distributed magnetic epoxy nanocomposites (MENCs) after curing. The core Fe3O4of the Fe3O4-PGMA NPs endows the MENCs with magnetic property, which is crucial for nondestructive flaw detection of the materials, while the shell PGMA promotes colloidal stability and prevents NP aggregation during curing. The eddy current testing (ET) technique is first applied to detect flaws in the MENCs. Through the brightness contrast of the ET image, surficial and subsurficial flaws in MENCs can be detected, even for MENCs with low content of Fe3O4-PGMA NPs (1 wt %). The incorporation of Fe3O4-PGMA NPs can be easily extended to other polymer and polymer-based composite systems and opens a new and very promising pathway toward MNP-based nondestructive flaw detection in polymeric materials.
Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Straße 6, 01069 Dresden, Germany.|Organische Chemie der Polymere, Technische Universität Dresden , 01062 Dresden, Germany.
Mimi
M
Hetti
Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Straße 6, 01069 Dresden, Germany.|Organische Chemie der Polymere, Technische Universität Dresden , 01062 Dresden, Germany.
Qiang
Q
Wei
Bundesanstalt für Materialforschung und -prüfung , 12205 Berlin, Germany.
Rainer
R
Pohl
Bundesanstalt für Materialforschung und -prüfung , 12205 Berlin, Germany.
Ralf
R
Casperson
Institute of Textile Machinery and High Performance Material Technology, Technische Universität Dresden , 01069 Dresden, Germany.
Matthias
M
Bartusch
Leibniz-Institut für Festkörper- und Werkstoffforschung, Institut für Metallische Werkstoffe , 01069 Dresden, Germany.
Volker
V
Neu
Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Straße 6, 01069 Dresden, Germany.
Doris
D
Pospiech
Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Straße 6, 01069 Dresden, Germany.|Organische Chemie der Polymere, Technische Universität Dresden , 01062 Dresden, Germany.
Brigitte
B
Voit
atom transfer radical polymerization; magnetic nanocomposites; magnetite nanoparticles; nondestructive flaw detection; poly(glycidyl methacrylate)