Method for measuring the change in conductivity of a visco-elastic material during its production by combining rheological and dielectric testing methods

摘要

The method comprises combining a rheological test method for detecting dynamic-mechanical properties with an electrical test method for detecting electrical properties of a viscoelastic material, inserting a test specimen at 120[deg] C from a partially crosslinked viscoelastic material in a measuring chamber of a rheometer, measuring an electrical conductivity of the test specimen as an initial conductivity according to a rest phase, partially crosslinking the test specimen at 150-180[deg] C under rheometer conditions, and measuring the measuring chamber of the electrical conductivity. The method comprises combining a rheological test method for detecting dynamic-mechanical properties with an electrical test method for detecting electrical properties of a viscoelastic material, inserting a test specimen at 120[deg] C from a partially crosslinked viscoelastic material in a measuring chamber of a rheometer, measuring an electrical conductivity of the test specimen as an initial conductivity according to a rest phase, partially crosslinking the test specimen at 150-180[deg] C under rheometer conditions, measuring the measuring chamber of the electrical conductivity of a partially crosslinked test specimen as a final conductivity after cooling the test specimen at 70[deg] C in a closed manner and kept under closing pressure, forming the test specimen of the viscoelastic material in the measuring chamber of the rheometer, and measuring the measuring chamber of the rheometer for detecting the change in conductivity of an initial conductivity and the final conductivity of the test specimen connected with processing of the viscoelastic material in a closed manner and kept under the closing pressure. The measuring chamber of the rheometer is equipped with electrodes in a frame of the rheological test method, where the measuring chamber allows to measure and to monitor a resistance through the test specimen. The electrode is a biconical two disk system. The test specimen has a density of 3 cm 3. The measuring chamber of the rheometer obtains a temperature of 120-180[deg] C. The viscoelastic material is a rubber mixture consisting of a rubber component, a conductive additive, and other blend ingredients for measuring the change in conductivity.