Physical Properties of Aromatic Hydrocarbons. I. Viscous and Viscoelastic Behavior of 1:3:5hyphen;Trihyphen;agr;hyphen;Naphthyl Benzene

摘要

The torsional creep and creep recovery behavior of amorphous 1,3,5hyphen;trihyphen;agr;hyphen;naphthyl benzene was studied, while at metastable equilibrium density, along a specified glassy volumemdash;temperature line, and during isothermal volume contraction below the conventional glass transition temperatureTg.Dilatometric measurements confirmed the conventionalTgto be 69deg;C. The viscosity measurements of Magill and Ubbelohde were extended from 185deg;C to belowTg,covering viscosity values from 10minus;1to 1016P. In a region of time scale the mechanical response was found to be dominated by Andrade creep. The retardation spectrum found was over 9 logarithmic decades wide in contrast to reportedly narrow spectra exhibited by other liquids with similar molecular weights. A steadyhyphen;state complianceJeof 2.6times;10minus;10cm2/dyn at 64.2deg;C was measured. Although compliances as low as 8times;10minus;11cm2/dyn were measured, no timehyphen;independent glassy complianceJgcould be ascertained. Freehyphen;volume theory was found applicable to all measurements made below 120deg;C. The occupied volumev0was deduced to be temperature insensitive.