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Melt viscosities of molten poly(ethylene terephthalate) calculated from modified Bueche‐Harding equation
Author(s) -
Gregory D. R.
Publication year - 1972
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.1972.070160617
Subject(s) - viscosity , poly ethylene , materials science , thermodynamics , ethylene , newtonian fluid , shear (geology) , shear viscosity , rheology , polymer chemistry , composite material , polymer science , chemistry , organic chemistry , physics , catalysis
Abstract The semiempirical Bueche‐Harding equation was successfully modified to allow the calculation of experimentally verified melt viscosities of molten poly(ethylene terephthalate) (PET) for shear stresses > 9.65 × 10 5 dynes/cm 2 by accounting for the definite Newtonian region in the flow behavior of PET for shear stresses lE; 9.65 × 10 5 dynes/cm 2 . Melt viscosity values calculated from the modified Bueche‐Harding equation agreed within ±12% of the values calculated from the equations based on experimental data.