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PVC melt rheology III: The effect of order and molecular weight on the shear rate dependence
Author(s) -
Collins Edward A.,
Daniels Charles A.
Publication year - 1974
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760140509
Subject(s) - shear rate , materials science , rheology , shear (geology) , polymer , thermodynamics , viscosity , polymerization , composite material , apparent viscosity , limiting , polymer chemistry , mechanical engineering , physics , engineering
The effect of polymerization temperature on the melt flow behavior of PVC of varying molecular weights has been studied over a wide shear rate range. For the same molecular weight, higher melt viscosities are observed for polymers prepared at lower temperatures. The shear rate dependence of the viscosity vs molecular weight plot is shown to be nonlinear over the shear rates examined. The inability to achieve a limiting zero‐shear viscosity is discussed.