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Rheological behavior of poly(1,4‐butylene isophthalate) containing sodium sulfonate groups
Author(s) -
Munari Andrea,
Fiorini Maurizio,
Pezzin Giovanni,
Pilati Francesco
Publication year - 1993
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.1993.070500117
Subject(s) - arrhenius equation , rheology , activation energy , sulfonate , viscosity , glass transition , polymer chemistry , materials science , ionic bonding , atmospheric temperature range , sodium , polyelectrolyte , thermodynamics , polymer , chemistry , organic chemistry , composite material , physics , metallurgy , ion
The steady‐state rheological behavior in the melt of poly(1,4‐butylene isophthalate)s containing various amounts of sodium sulfonate groups has been investigated using a capillary rheometer. It has been found that the presence of SO 3 Na groups strongly enhances the melt viscosity and this result cannot be explained as due to the small increase of the glass transition temperature, but has to be attributed to the relevant interactions between ionic groups. Measurements carried out at different temperatures in the range 190–220°C have shown that the “Newtonian” viscosity of sulfonated poly(1,4‐butylene isophthalate) is well correlated to temperature by an Arrhenius‐type equation. The activation energy for melt flow has been found to increase linearly with SO 3 Na group content in the polymer. Fur‐thermore, it has been found that for samples having a content of ionic groups of 5% or higher and a sufficiently high molecular weight the time–temperature superposition principle does not hold. © 1993 John Wiley & Sons, Inc.