On 22 september 2017, David Dupenne has defended his thesis. Awarded by University of Toulouse III – Paul Sabatier, his work was supervised by both CIRIMAT laboratory (CNRS/INPT/UT3 Paul Sabatier) and IRT Saint Exupéry. The high quality and the relevance of David’s thesis contributed to get significant results as a part of SURFINNOV project.
THESIS SUBJECT
“Design of a polymer extrinsic conductive coating / silver submicron wires: application to the metallization of thermosetting substrate loaded with carbon fibers for spatial purpose”
About this thesis
This work describes the achievement and the study of an original process to permit the surface metallization of carbon fiber reinforced polymer (CFRP) substrates filled with carbon fibers through a conductive polymer coating for electromagnetic shielding applications. This conductive coating consists of a polyurethane (PU) matrix containing silver nanowires (AgNWs) obtained by a polyol process. The study of the molecular mobility of PU matrix and the influence of AgNWs on the physical properties of the matrix were carried out. The PU/AgNWs coating exhibits a very low volume and surface percolation threshold less than 1 % by volume. Above this percolation threshold, the surface conductivity allows metal electroplating. Optimal electrodeposition parameters were determined. A homogeneous and uniform deposition is obtained on the low-filled coatings (4 %vol). The metallic layer adheres to substrate for large thermal variations, by adapting the stresses of the thermal expansion. The EM shielding efficiency was measured from 1 to 26 gigahertz.
SURFINNOV PROJECT
Development of corrosion protection solutions for light alloys, improvement of tribological properties of the titanium and improvement of surface treatments versus the temperature.
Jury
- Dr. E. Dantras, Cirimat – CNRS – PhD Advisor
- Dr. A. Lonjon, Cirimat – CNRS – PhD Advisor
- Pr. C. Brosseau, Université de Bretagne Occidentale – Rapporteur
- Dr. G. Boiteux, Université de Lyon – Rapporteur
- Pr. P. Olivier, Université de Toulouse – Examiner
- Dr. F. Léonardi, Université de Pau et des Pays de l’Adour – Examiner
- Mr. T. Pierré, IRT Saint Exupéry – Thales Alenia Space – Invited
PUBLICATIONS
D. Dupenne, A. Roggero, E. Dantras, A. Lonjon, T. Pierré, C. Lacabanne:“Dynamic molecular mobility of polyurethane by a broad range dielectric and mechanical analysis”. Journal of Non-Crystalline Solids (ISSN : 0022-3093), 2017-04
D. Dupenne, T. Pierré, A. Lonjon and E. Dantras: “Electrical conductivity improvement of epoxy matrix composite surface by conductive coating”. JIP-JEPO 2015, Donostia-San Sebastian (Spain). 2015
D. Dupenne, T. Pierré, B. Rives, A. Lonjon and E. Dantras: “Polymer composite surface metallization for space applications”. 10ème édition du Forum Technique des Membres d’Aerospace Valley, Arcachon (France). 2015
D. Dupenne, T. Pierré, A. Lonjon and E. Dantras: “Metallization of CFRP surface via a conductive underlayer”.ECNP (Xth European Conference on Nanostructured Polymers and Nanocomposites), Roma (Italy). 2016