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Residence time effects during capillary flow of a rigid PVC formulation
Author(s) -
RangelNafaile C.,
GarcíaRejón A.,
León A. García
Publication year - 1984
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.730060205
Subject(s) - capillary action , rheometer , residence time (fluid dynamics) , flow properties , materials science , flow (mathematics) , shear stress , mechanics , shear (geology) , composite material , thermodynamics , chemistry , rheology , geotechnical engineering , physics , geology
A typical rigid PVC formulation was rheologically characterized using capillary and parallel plate rheometers within regular processing temperatures and deformations. At 190°C and in an intermediate range of shear rates (10 to 100 l/s) the stress response was a function of the flowing time in the capillary. This behavior was not observed at other temperatures (170 and 210°C). Small amplitude oscillary shear experiments for the same compound but with various thermomechanical histories showed a different behavior as compared to the results of the capillary flow. The specific results of the capillary experiments are consistent with the hypothesis of particulate flow of PVC and also point out the influence of the stabilizers and lubricants in the flow behavior of the compound. The time dependent effect is analyzed in terms of the coupling of thermal and mechanical stresses with the unmelted particles present in the flow field.