STP1357

    Mechanical Properties of Degraded PMR-15 Resin

    Published: Jan 2000


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    Abstract

    Thermo-oxidative aging produces a non-uniform degradation state in PMR-15 resin. A surface layer, usually attributed to oxidative degradation, forms. This surface layer has different properties from the inner material. A set of material tests was designed to separate the properties of the oxidized surface layer from the properties of interior material. Test specimens were aged at 316°C in either air or nitrogen, for durations of up to 800 h. The thickness of the oxidized surface layer in air aged specimens, and the shrinkage and coefficient of thermal expansion (CTE) of nitrogen aged specimens were measured directly. Four-point-bend tests were performed to determine modulus of both the oxidized surface layer and the interior material. Bimaterial strip specimens consisting of oxidized surface material and unoxidized interior material were constructed and used to determine surface layer shrinkage and CTE. Results confirm that the surface layer and core materials have substantially different properties.

    Keywords:

    testing, aging, degradation, polymer matrix, material properties, test methods


    Author Information:

    Tsuji, LC
    Graduate Student and Associate Professor, Massachusetts Institute of Technology, Cambridge, MA

    McManus, HL
    Graduate Student and Associate Professor, Massachusetts Institute of Technology, Cambridge, MA

    Bowles, KJ
    Senior Material Engineer, NASA Lewis Research Center, Cleveland, OH


    Paper ID: STP15826S

    Committee/Subcommittee: D30.08

    DOI: 10.1520/STP15826S


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