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Effect of extrusion temperature on elongational flow behavior of PVC melt
Author(s) -
Park Im K.
Publication year - 1981
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730030304
Subject(s) - rheometer , extrusion , materials science , rheology , activation energy , creep , extensional definition , composite material , strain rate , viscosity , ultimate tensile strength , flow (mathematics) , thermodynamics , mechanics , chemistry , paleontology , physics , organic chemistry , biology , tectonics
The effect of the sample extrusion temperature between 160° and 180°C on the elongational flow properties of a low molecular weight suspension PVC (unplasticized) has been studied with the Rheometrics Extensional Rheometer. The results of both the tensile creep measurements at a constant stress of 24 KPa and the stretching experiment at a constant strain rate of 0.01 sec −1 indicated the existence of a rheological transition at 185°C marked by the dual valued flow activation energy and also by the temperature dependence of the tensile stress‐strain curves. Increasing extrusion temperature increased both the flow activation energy and the extensional viscosity below the transition temperature.