1 Department of Wind Energy, Technical University of Denmark2 Composites and Materials Mechanics, Department of Wind Energy, Technical University of Denmark3 Department of Energy Conversion and Storage, Technical University of Denmark4 Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark5 Department of Physics, Technical University of Denmark6 Plasma Physics and Fusion Energy, Department of Physics, Technical University of Denmark7 Risø National Laboratory for Sustainable Energy, Technical University of Denmark8 University of Southern Denmark9 Danish Technological Institute10 FORCE Technology11 Danish Technological Institute12 FORCE Technology
Journal of Adhesion Science and Technology
Glass-fiber-reinforced polyester (GFRP) plates are treated using a 50Hz dielectric barrier discharge at a peak-to-peak voltage of 30 kV in helium at atmospheric pressure with and without ultrasonic irradiation to study adhesion improvement. The ultrasonic waves at the fundamental frequency of around 30 kHz with the sound pressure level of approximately 155 dB were introduced vertically to the GFRP surface through a cylindrical waveguide. The polar component of the surface energy was almost unchanged after the plasma treatment without ultrasonic irradiation, but drastically increased approximately from 20 up to 80 mJm2 with ultrasonic irradiation. The plasma treatment with ultrasonic irradiation also introduced oxygen- and nitrogen-containing functional groups at the GFRP surface. These changes would improve the adhesion properties of the GFRP plates.
Journal of Adhesion Science and Technology, 2013, Vol 27, Issue 7, p. 825-833