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DOE OSTI · 1872724

Significant slowdown of plasma-optimized surface energy deactivation by vacuum sealing for efficient adhesive bonding

Shin, Yongsoon·Qiao, Yao·Canfield, Nathan·Yu, Zeyang·Meyer, III, Harry M.·Merkel, Daniel R.·Nickerson, Ethan K.·Kanbargi, Nihal S.·Ortiz, Angel·Naskar, Amit K.·Simmons, Kevin L.
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Abstract

This work proposes an approach to minimize surface energy deactivation of plasma-treated metal and carbon fiber-reinforced polymer (CFRP) surfaces by vacuum sealing. Plasma treatments enhance adhesive wettability on post-treated surfaces for adhesive joints, but the treated surfaces deactivate quickly in air. The surface energy of aluminum alloy AA6061 and carbon fiber-reinforced polymer-polyamide (CFRP-PA66) optimally treated by a blown air plasma instrument returns to the original surface energy within one hour. Vacuum sealing of AA6061 and CFRP-PA66 reduced the surface energy deactivation over 7 days by at least 230 times and 970 times compared to in air. Double Cantilever Beam (DCB) tests performed on adhesively-bonded AA6061/CFRP-PA66 joints showed that the total energy release and energy dissipation before failure of plasma-treated and vacuum-sealed materials was up to 60% more than plasma-treated materials without vacuum sealing and up to 125% more than non-plasma-treated materials.

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42 ENGINEERINGMode-I fractureactivation and deactivationadhesive bondingadhesive failuredouble cantilever beamenergy release and dissipationjoint/joiningplasma treatmentpolymer-matrix compositesstabilitysurface analysissurface energysurface free energysurface treatmentswetting

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Shin, Yongsoon, Qiao, Yao, Canfield, Nathan, Yu, Zeyang, Meyer, III, Harry M., Merkel, Daniel R., Nickerson, Ethan K., Kanbargi, Nihal S., Ortiz, Angel, Naskar, Amit K., Simmons, Kevin L.. 2022-05-30. Significant slowdown of plasma-optimized surface energy deactivation by vacuum sealing for efficient adhesive bonding. https://doi.org/10.1016/j.compositesb.2022.110001

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