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Communication Dans Un Congrès Année : 2020

Three-dimensional imaging of metal/epoxy interface using time-domain Brillouin scattering

Résumé

Epoxies are the type of reactive polymers used as adhesive or paints in a wide range of industrial applications such as automotive and aerospace. The mechanical properties in the proximity of metal/epoxy interfaces play a crucial role in the bond strength and stability of adhesion. The metal/epoxy interfaces were generally studied using techniques like atomic force microscopy (AFM) and frequency-domain Brillouin scattering (FDBS) microscopy [1,2]. AFM provides information at nanoscale distances from the interface, but the destructive cut of the sample for the investigation could modify the epoxy, while the depth spatial resolution in the FDBS experiments was limited to 10 �m [2]. We report the implementation of the time-domain Brillouin scattering (TDBS) method with a fast data acquisition technique based on asynchronous optical sampling (ASOPS) to examine the metal/epoxy interface in its micrometers vicinity with nanometers depth resolution. We have performed experiments on 50 �m-thick epoxy resin film on Aluminum plate. For the epoxy, we used the combination of diglycidyl ether of bisphenol-A (DGEBA) and diethylenetriamine (DETA). We focused the laser pump pulse at 515 nm wavelength on the Aluminum plate from the epoxy side, which generates the acoustic waves. Their propagation through epoxy is detected from the same side using the probe pulse at 532 nm wavelength. We observed in the signal the Brillouin oscillations of up to ~0.5 ns duration, which implies gigahertz acoustic waves propagation to a depth of ~1.5 �m from the interface. The analysis of these oscillations as a function of time at various lateral locations of the epoxy could produce a three-dimensional image of the mechanical properties in nanometers depth resolution. Acknowledgments: The grant ANR-18-CE42-017 supports this research. [1] H. Kishi et al., J. Polym. Sci. Polym. Phys. 45, 1425 (2007). [2] J. K. Kr�ger et al., J. Adhes. 80, 585 (2004).
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Dates et versions

hal-03240276 , version 1 (28-05-2021)

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Sandeep Sathyan, Samuel Raetz, Erwan Nicol, Mathieu E Edely, Nikolay Chigarev, et al.. Three-dimensional imaging of metal/epoxy interface using time-domain Brillouin scattering. Forum Acusticum, Dec 2020, Lyon, France. pp.1899-1899, ⟨10.48465/fa.2020.0513⟩. ⟨hal-03240276⟩
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