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International audienceParticle flux effects on polymer physicochemical degradations were investigated. Different polymers were studied depending on application: silicone, fluoropolymer, acrylic, epoxy, polyimide, polyurethane, etc. Polymers with surface functional properties (paint, coating, etc.) were dissociated from polymers with bulk properties (potting, cable, etc.). Surface materials were exposed to protons, and bulk materials were exposed to electron radiations. Two fluxes were used: 5 × 10 11 and 7.4 × 10 12 cm −2 · s −1 for electrons and 8.7 × 10 9 and 2.2 × 10 11 cm −2 · s −1 for protons. The total dose was fixed at 500 Mrad for electron radiations and 1 Grad for proton radiations. Functional properties (thermo-optical and mechanical) depending on material application were measured before and after irradiation exposure. Chemical structure modifications were also investigated. From all combined results, no global tendency was evidenced. The study shows that low or high irradiation flux induces more or less degradations according to polymer type, the composition of the polymer, and functional properties of concern. Flux effects can also depend on particle nature (electron or proton). The last point was highlighted by silicone polymer degradations; high proton flux caused more damage than low flux. On the contrary, low electron flux induced more degradations than high flux

Particle Flux Effects on Physicochemical Polymer Degradations