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  • The temperature and frequency dependence of the bulk compliance of Poly(vinyl acetate). A re-examination
    Deng, T. H. ; Knauss, Wolfgang G.
    Measurements are described and analyzed for the determination of the dynamic bulk compliance for Poly(vinyl acetate) [PVAc] as a function of frequency and temperature at atmospheric pressure to ... generate a master compliance curve over a total frequency range of about 12 decades. Measurements are based on the compressibility of a specimen confined to an oil-filled cavity resulting from pressurization by a piezoelectric driver and response of a like receiver. Experimental problems addressing limitations in resolution capability are discussed. The results are compared with the classical measurements obtained by McKinney and Belcher over thirty years ago. Further comparison of the bulk with shear compliance data shows that the extent of the transition ranges for the two material functions are comparable, but the two transitions belong to different time scales, that of the bulk response falling mostly into the glassy domain of the shear behavior. One concludes thus that for linearly viscoelastic response the molecular mechanisms contributing to shear and bulk deformations have different conformational sources.
    Type of material - article, component part
    Publish date - 1997
    Language - english
    COBISS.SI-ID - 4037147