Particle 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: 5×1011 and 7.4×1012  cm−2·s−1 for electrons and 8.7×109 and 2.2×1011  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.


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    Title :

    Particle Flux Effects on Physicochemical Polymer Degradations




    Publication date :

    2016




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    Local classification TIB:    770/7040
    BKL:    55.60 Raumfahrttechnik




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