Innovative nanocomposite structural adhesives


CALL: 2008

DOMAIN: MS - New Functional and Intelligent Materials and Surfaces






KEYWORDS: structural adhesive

START: 2009-01-01

END: 2010-12-31


Submitted Abstract

Materials filled with particles of at least one dimension in the nanosize ränge (up to ca. 500 um) often are referred to as nano-composites. Such materials are of high interest in, numerous areas, such as structural adhesive applications. Inorganic particles incorporation can hnpart attractive properties in epoxy matrices. The project deals with the incorporation of appropriate grafted nano-particles (surface fimctionalization) in an epoxy matrix in order to improve the Performance of the adhesive Joint between two aluminum foils. Increasing the thermo-mechanical properties of such an assembly can be of great technological interest since thermo-mechanical resistance of adhesive joints suffers from the intrinsic weaknesses from polymers, i.e. limited resistance to temperature. In such Systems, interactions between Substrate and epoxy adhesive, leading to the interphase formation, and effect of nano-particles grafting on physico-chemical properties of the composite material are not well understood. Furthermore, there are only very few publications dealing with induced mechanicals properties of a structural assembly. In order to improve knowledge about these topics, a multitechnique approach will be used, combining experimental approach and theoretical modeling. The morphology and the distribution of the particles inside the matrix, and interphase formation will be studied by environmental scanning electron microscopy coupled with Energy dispersive X-ray spectroscopy (ESEM-EDX). Fourier transform Infrared spectroscopy (FTIR) and thermogravimetric analyses (TGA) will be used to study fimctionalization. Finally, the effect of grafting and particles incorporation on the viscoelastic properties, of epoxy resin and its assemblies, will studied by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC).To understand the nature of bond formation at the polymer-metal interface, molecular dynamics (MD) simulations will be performed. The interfacial bonding (and consequently adhesion) is influenced directly by the way the interface is formed. MD modeling of interface formation has the potential to yield significant progress in the field of adhesion between metals and polymers. To simulate the macroscopic response, a multiscale approach will be developed. In this approach, the MD Simulation results will be used in the continuum based micromechanical constitutive laws. In this way, interfacial phenomena will be accounted for through the MD results. This model will be used to predict the thermo-mechanical properties and to simulate the thermo-mechanical response of the assembly. A correlation with thermo-mechanical measurements such as DMA results, as well as mechanical tests such as simple shear, will be performed.

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