Measurement of the low-frequency shear modulus of polymeric liquids

The present work describes the resonance method for measurement of a low-frequency (about 10(5) Hz) complex shear modulus of liquids by the use of a piezoquartz crystal. The problem of interaction of an oscillating system of the type piezoquartz-liquid interlayer-cover plate is analyzed. From the analysis of the problem there follow three methods for measuring the elasticity modulus of liquids. The investigation results of a homologous series of polymethyl siloxane liquids are presented. It has been shown that as the molecular weight of the series being investigated increases, the elasticity modulus value also increases, while the mechanical losses angle tangent passes through its maximum.