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A study of low shear viscosity of polymer melts
Author(s) -
Chee K. K.,
Rudin A.
Publication year - 1970
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450480404
Subject(s) - viscometer , polymer , polystyrene , materials science , shear (geology) , newtonian fluid , rheology , extrapolation , non newtonian fluid , shear thinning , viscosity , composite material , thermodynamics , apparent viscosity , mechanics , physics , mathematics , mathematical analysis
An inexpensive, accurate falling coaxial cylinder viscometer is described. Viscosities can be measured at shear stresses at least as low as 10 3 dynes per cm 2 and flow curves can be obtained with shear thinning fluids. Data for a polystyrene and a polyethylene polymer coincide with those from other techniques and with corresponding literature values. The lower Newtonian viscosities pf both polymers were experimentally accessible, and it is shown that estimation of η o by extrapolation from viscosities in the non‐Newtonian region may be subject to errors of uncertain magnitude. Shear history of the sample affects the Newtonian and low shear viscosities of high molecular weight polymer melts.