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Time‐dependent capillary flow of polystyrene
Author(s) -
Rudin A.,
Leeder D. R.
Publication year - 1968
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.1968.070121008
Subject(s) - polystyrene , viscometer , polymer , materials science , flow (mathematics) , flow properties , capillary action , polymer chemistry , shear flow , thermodynamics , composite material , viscosity , mechanics , physics
The nonsteady flow behavior of a characterized commercial polystyrene has been examined in a compressed‐nitrogen‐gas piston viscometer. Nonsteady flow data were erratic with virgin polymer at 173.9°C. Pretreatment of the polystyrene by subjecting the melt to a higher temperature, with or without shear, changed the nature of the time‐dependent flow to that which is generally characteristic of polymers in experiments of this type. The pretreatment had no significant effect on the equilibrium flow curve at the same temperature nor on the molecular weight of the polystyrene. The results are interpreted in terms of changes in the size or nature of supermolecular flow units.