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The viscosity of monomolecular melts of poly(vinyl chloride)
Author(s) -
LyngaaeJørgensen J.
Publication year - 1976
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.1976.070200918
Subject(s) - viscosity , shearing (physics) , thermodynamics , vinyl chloride , materials science , homogeneous , relative viscosity , reduced viscosity , shear rate , polymer chemistry , chemistry , shear flow , composite material , polymer , physics , copolymer
Abstract PVC melts are predicted to be homogeneous with single molecules as the stable flow units (monomolecular melts) at corresponding values of high temperatures and/or high shear stresses. Under these conditions, it is found that the zero shear viscosity in simple shearing flow of rigid compounds depends on the average molecular weight by weight to the 3.5 power for molecular weights between 24,000 and 100,000. All data measured under conditions where monomolecular melts are predicted fall on a master curve of reduced viscosity versus reduced shear rate when a relaxation time proportional to η0/ c 2 T is used. It is, therefore, concluded that monomolecular melts of PVC compounds follow the same structure–viscosity relations as found for other linear melts in viscometric flow.