Dimensionless loss modulus

Oscillatory shear data on dilute solutions of polystyrene with M= 860000 gmol in two -solvents (circles are in decalin at 16°C and squares are in di-2-ethylhexyl phthalate at 22 °C). Open symbols are the dimensionless storage modulus and filled symbols are the dimensionless loss-... 

A dimensionless separation parameter e measures the distance to the transition which lies at e = 0. A fluid state (e < 0) possesses a (Newtonian) viscosity, t]o(e < 0) = limy oO (y)/7> and shows shear-thinning upon increasing y. Via the relation rjo = lim o G"(a))/a), the Newtonian viscosity can also be taken from the linear response loss modulus at low frequencies, where G"((u) dominates over the storage modulus. The latter varies like G ((U 0) (o. A glass (e > 0), in the... 

The loss tangent (tan 8) is a dimensionless term that describes the ratio of the loss modulus (G") to the storage modulus (G ), and this may be usefully employed to convey information concerning the structure of the polymeric system in question. This is frequently referred to as the mechanical damping parameter. To substantiate... 

The real part G (imaginary part G"((o) are called the storage modulus and the loss modulus. Experimental results are often expressed by the dimensionless intrinsic moduli defined by ... 

Viscoelastic properties. The parameters measured were storage modulus (G ), loss modulus (G"), dynamic viscosity (t] ). and tan 8 (dimensionless). The storage modulus (G ) is a measure of the energy stored and recovered per cycle of sinusoidal deformation and is indicative of the elastic nature of a substance the loss modulus (G") is a measure of the energy lost per cycle of sinusoidal deformation and is indicative of the viscous nature of a substance (Ferry, 1970). Dynamic viscosity (t) ) is related to G" by... 

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