Premium
Low shear viscosity and crystallization in dilute solutions of polymers at high pressures: Falling body viscometry of high molecular weight polyethylene solutions
Author(s) -
Akki Rashi,
Bair Scott,
Abhiraman A. S.
Publication year - 1995
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.760352207
Subject(s) - viscometer , rheology , materials science , crystallization , polymer , viscosity , thermodynamics , polyethylene , phase (matter) , extrusion , crystallization of polymers , calorimetry , chemical engineering , composite material , polymer chemistry , organic chemistry , chemistry , physics , engineering
A specially designed falling body viscometer has been used to obtain low shear viscosities of dilute solutions of high molecular weight polyethylene in decalin and for detecting phase transitions at high pressures. The method provides valuable rheological data at pressures that correspond to those I lubrication and some extrusion processes. In addition, the method enables detection of phase transitions, such as crystallization, that result in detectable changes in rheology. The influence of pressure as high as 0.6 GPa ( ∼ 80.000 psi) is illustrated here through a study of crystallization, with verification from light scattering and calorimetry.