Abstract
The viscoelastic behaviour of di(2-ethylhexyl) phthalate and bis(m-(m-phenoxy phenoxy)- phenyl) ether has been determined as a function of pressure under conditions of alternating shear. The shear mechanical resistance has been measured at frequencies of 10 and 30 MHz. For di(2-ethylhexyl) phthalate the pressure range of measurement extended to 1400 MN/m
2
and to 300 MN/m
2
for bis(m-(m-phenoxy phenoxy)phenyl) ether. Associated measurements have also been made of the density, p, and steady-flow viscosity, η, of each liquid as a function of pressure, the viscosity results being confined to the range 0.001 to 300 N s/m
2
. The limiting shear modulus,
G
∞
, of each liquid has been found to vary linearly with pressure whilst, within experimental error, the viscoelastic relaxation can be represented by an equation put forward by Barlow, Erginsav & Lamb (1967
a
),
J
*(jw) = J
∞
[1+1/jwr
m
]+2J∞/jwr
m
)1/2
J
*(jw) is the complex compliance measured at angular frequency w, J
∞
(= 1/(G
∞
) is the limiting high-frequency shear compliance and r
m
is the ‘Maxwell relaxation time’ equal to n/J
∞
. This equation gives an adequate description of the relaxational behaviour when due account is taken of the variation of viscosity, density and shear modulus with pressure and temperature.
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