Some selected problems in the determination of flow curves of non-plasticized poly(vinyl chloride) compounds by extrusiometry
Some selected problems in the determination of flow curves of non-plasticized poly(vinyl chloride)
compounds by extrusiometry
The advantages and limitations of the capillary viscometry and extrusiometry methods used in the determination of flow curves of polymers in plastic state as well as difficulties accompanying the tests by these methods on non-plasticized poly(vinyl chloride) compounds resulting from the particular features of these compounds have been presented. The suitability of extrusiometry in testing brigid PVC compounds in plastified state has been stressed and the sources of errors which can considerably falsify the test results have been argued. The results of own extrusiometric investigations of non-plasticized PVC compounds used in the manufacture of pressure pipes have been discussed. A set of nozzles with a diversified geometrical characteristics has been used. A statistical evaluation of flow curves at three different temperatures (180, 190, and 200°C) calculated according to two generally accepted mathematical models of Ostwald de Waele and Prandtl has been presented. The suitability of both models for the description of experimental data for non-plasticized PVC compound investigated has been demonstrated.
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