One of the interesting features of polymeric materials is that their properties are time dependent. When constant load is applied to the material, two fundamental processes occur, creep and relaxation. Time dependent properties for diverse polymers are fairly known in case of single axis and shear load, however, little information is available on time dependent volumetric properties of materials.
The thesis discusses volumetric properties of the selected polymeric material polycarbonate. Measurements were performed on an apparatus, called CEM Measuring System, where time dependent volumetric properties were measured at various pressures and temperatures. Thermal coefficient of linear expansion, the specific volume and bulk creep compliance were determined by analyzing and processing measurement data.
|
