Dielectric relaxation behaviour and the ductile/brittle transition of polycarbonate

David C. Watts, E. Philip Perry

    Research output: Contribution to journalArticlepeer-review


    Injection moulded polydiancarbonate has been studied mechanically and dielectrically and compared with annealed and embrittled material. The two forms of polycarbonate differ by a factor of four in impact strength under plane stress conditions but there is no substantial difference in their low temperature dielectric β-relaxations. This contraindicates explanations of their different properties and of the toughness of polycarbonate exclusively in terms of local main chain motions. Approximately 17% of the total chain units are mobile in the glassy state. The β-process is resolved into two processes at low temperatures, and the molecular origins of these, and of the intermediate temperature relaxation at 80°C, are discussed. © 1978.
    Original languageEnglish
    Pages (from-to)248-254
    Number of pages6
    Issue number3
    Publication statusPublished - Mar 1978


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