STP937: Mechanical Properties and Morphology of Poly(etheretherketone)

    Cebe, P
    NASA-NRC resident research associate, member technical staff, and technical group supervisor, California Institute of Technology, Pasadena, CA

    Hong, S-D
    Consultant, Los Angeles, CA

    Chung, S
    NASA-NRC resident research associate, member technical staff, and technical group supervisor, California Institute of Technology, Pasadena, CA

    Gupta, A
    NASA-NRC resident research associate, member technical staff, and technical group supervisor, California Institute of Technology, Pasadena, CA

    Pages: 16    Published: Jan 1987


    Abstract

    Mechanical properties and morphology of poly(etheretherketone) (PEEK) were studied for samples having different thermal histories. Isothermal and rate-dependent crystallization were studied to ascertain the relationship between crystallinity/morphology and processing condition. Degree of crystallinity and microstructure were controlled by cooling the melt at different rates, ranging from quenching to slowly cooling, and by annealing amorphous material above the glass transition temperature Tg. We found that degree of crystallinity was not as important as processing history in determining the room temperature mechanical properties. Samples with the same degree of crystallinity had very different tensile properties, depending on rate of cooling from the melt. All samples yielded by shear band formation and necked down. Quenched films had the largest breaking strains, drawing to 270%. Slowly cooled films exhibited ductile failure at relatively low strains. Best combined mechanical properties were obtained from semicrystalline films cooled at intermediate rates from the melt.

    Keywords:

    poly(etheretherketone) (PEEK), crystallinity, mechanical properties, morphology, thermal history


    Paper ID: STP24387S

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP24387S


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