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  • Aging bulk modulus obtained from enthalpy and volume relaxations of a-PMMA and its blends with PEO
    Slobodian, Petr ...
    Enthalpy and volume relaxation data measured on atactic poly(methyl methacrylate) and its blends with poly(ethylene oxide) are used to calculate an aging bulk modulus, K a , tentatively defined as ... the derivative (dh/dv) T . The Ka values are mainly lower than the corresponding bulk modulus data determined directly with a piston-type PVT-device. On the whole, however, the K a values can be considered as lying close to the moduli measured in the liquid state. This notion is supported by K a data measured on amorphous selenium, which has a significantly lower compressibility in the liquid state than common amorphous polymers. The results are discussed in terms of thermodynamics of irreversible processes using a single internal variable, yet without arriving at suitable expression for the enthalpy/volume derivative.
    Vir: Mechanics of time-dependent materials : an international journal devoted to the time-dependent behaviour of materials and structures. - ISSN 1385-2000 (Letn. 10, št. 1, 2006, str. 1-15)
    Vrsta gradiva - članek, sestavni del
    Leto - 2006
    Jezik - angleški
    COBISS.SI-ID - 9553435

    Povezava(-e):

    http://dx.doi.org/10.1007/s11043-006-9007-0

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