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Poly(vinyl chloride) thermal stability. I. Evaluation by melt rheology
Author(s) -
Collins Edward A.,
Krier Charles A.
Publication year - 1966
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.1966.070101014
Subject(s) - rheometry , rheology , thermogravimetric analysis , viscosity , materials science , reduced viscosity , vinyl chloride , relative viscosity , extrusion , polymer , activation energy , thermal stability , isothermal process , inherent viscosity , arrhenius plot , die swell , intrinsic viscosity , thermodynamics , polymer chemistry , chemistry , composite material , organic chemistry , physics , copolymer
Capillary rheometry is used to characterize the thermal stability of poly(vinyl chloride). By isothermally extruding the polymer melt at constant shear rate, apparent viscosity–time relationships are obtained having three distinct regions: ( 1 ) obtainment of equilibrium viscosity, ( 2 ) constant viscosity, and ( 3 ) rapidly changing viscosity. During regions 2 and 3 the polymer extrudate gradually changes in color from water clear to black. These characteristic regions are related to the temperature of extrusion by Arrhenius plots. An activation energy of 40 kcal./g.‐mole was calculated for the decomposition of PVC. Infrared spectroscopy, thermal gravimetric analysis, and intrinsic viscosity experiments are used to corroborate the results of the melt flow data.