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Dynamic‐mechanical behavior of poly(vinyl chloride), PVC, and chlorinated PVC compounds in the range of processing temperatures
Author(s) -
Bonnebat C.,
De Vries A. J.
Publication year - 1978
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.760181015
Subject(s) - materials science , vinyl chloride , time–temperature superposition , differential scanning calorimetry , composite material , viscosity , extrusion , atmospheric temperature range , viscoelasticity , thermodynamics , polymer , physics , copolymer
Both real and imaginary components of the complex shear viscosity have been determined as a function of strain amplitude, frequency and temperature for various samples of poly(vinyl chloride), PVC, and chlorinated PVC of increasing chlorine content, with the aid of a Rheometrics mechanical spectrometer using eccentric rotating disk geometry. Different methods of sample preparation (low temperature dry‐blending, high temperature extrusion or calendering) were used to study thermomechanical history effects. Results obtained in the region of “linear” viscoelastic behavior were compared with those of capillary flow experiments: at relatively high temperatures the validity of the Cox‐Merz relationship was confirmed. Use of time‐temperature superposition procedures made it possible to predict the important variation of viscosity over a broad range of shear rates. The experimental results in particular with regard to the strong influence of temperature and thermal history, were tentatively interpreted in terms of a supermolecular structure due to the presence of ordered domains (microcrystallites) of variable amount and size. This interpretation was shown to be consistent with differential scanning calorimetry.