MEASUREMENT OF THE LOW-FREQUENCY SHEAR MODULUS OF POLYMERIC LIQUIDS

The present work describes the resonance method for measurement of a l ow-frequency (about 10(5) Hz) complex shear modulus of liquids by the use of a piezoquartz crystal. The problem of interaction of an oscilla ting system of the type piezoquartz-liquid interlayer-cover plate is a nalyzed. From the analysis of the problem there follow three methods f or measuring the elasticity modulus of liquids. The investigation resu lts of a homologous series of polymethyl siloxane liquids are presente d. It has been shown that as the molecular weight of the series being investigated increases, the elasticity modulus value also increases, w hile the mechanical losses angle tangent passes through its maximum.