DIELECTRIC SPECTROSCOPY METHOD FOR POLAR POLYMERS ELASTIC PROPERTIES DIAGNOSTICS

Abstract

The mechanical properties of polymer materials are changes under the complex influence of such climatic factors as, for example, solar radiation, temperature changes, high humidity, and the impact of microorganisms – destructors. The methods of non-invasive diagnostics have to be used for changes prediction of the polymers materials products mechanical properties. The dielectric spectroscopy possibility using for diagnosing the modulus of elasticity of polymeric materials is considered in that paper. The results of elasticity modulus investigation by the dielectric spectroscopy using the DiMarzio–Bishop model and the mechanical measurements method are considered and compared in that paper. The results of dielectric and mechanical properties of polymers samples (polymethylmethacrylate, polycarbonate and polyvinylchloride) investigation are considered in that paper. These polymers are polar, so their mechanical properties in the elastic region of deformations can be investigate by dielectric spectroscopy method. This is due to the fact that the elastic deformations of a polymer are determined by the deformation of its macromolecules. It is show, that there are qualitative agreements between results of that measurement and the DiMarzio–Bishop model have to be refinement. The dipoles are represented as a spheres and interaction between dipoles are neglected in the DiMarzio–Bishop model. In our opinion, the interaction between dipoles in polymeric macromolecules is inevitable, and the configuration of dipoles differs from spherical. The necessity of using the calibration coefficient in the DiMarzio–Bishop model is shown by comparing the results of elastic modulus experimental measurements by the mechanical method and the dielectric spectroscopy method. This calibration factor takes into account the average number of dipoles in a macromolecule with a coefficient proportionality ∼6,7⋅10–5.