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Rheological comparison of four blow molding resins
Author(s) -
GarciaHejon A.,
Dealy J. M.,
Kamal M. R.
Publication year - 1981
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.5450590109
Subject(s) - die swell , rheology , materials science , composite material , polypropylene , molding (decorative) , shear viscosity , shear rate , shear stress , viscosity , elongation , polymer , plastics extrusion , ultimate tensile strength
For molten polymers, each theological property provides a different basis for comparison and characterization. This point is illustrated by reference to the results of an extensive testing program involving a series of four commercial blow molding resins, each produced by a different Canadian manufacturer. Three high density polyethylenes were studied at 170°C, while a polypropylene was studied at 190°C. Properties measured included viscosity, first normal stress difference, dynamic viscosity, storage modulus, extrudate swell as a function of time and shear rate, and stress growth functions for both shear and uniaxial elongation.