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Flow instability in capillary extrusion of plasticized poly(vinyl chloride)
Author(s) -
Yamaguchi Masayuki
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1961
Subject(s) - extrusion , plasticizer , vinyl chloride , die swell , materials science , composite material , capillary action , residence time (fluid dynamics) , relaxation (psychology) , shear (geology) , polymer chemistry , instability , polymer , copolymer , mechanics , geotechnical engineering , psychology , social psychology , physics , engineering
Flow instability in a capillary extrusion is studied for a high molecular weight, plasticized poly(vinyl chloride) (PVC). The onset of melt fracture correlates with the long time relaxation ascribed to the generation and/or growth of PVC crystallites. An increase in the residence time in the cylinder leads to this long time relaxation and results in the melt fracture, although the apparent shear stress remains constant, irrespective of the residence time. The extrudate temperature and the species of the plasticizer also have a significant influence on the apparatus of the extruded products. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 1277–1283, 2001