Influence of water content, time, and temperature on the rheological behavior of polyethylene terephtalate

In this work, the main factors affecting the rheological behavior of polyethylene terephtalate (PET) in the linear viscoelastic regime (water content, time delay before test, duration of experiment, and temperature) were accessed. Small amplitude oscillatory shear tests were performed after differen...

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Bibliographic Details
Published in:Journal of applied polymer science 2010-06, Vol.116 (6), p.3525-3533
Main Authors: Souza, A.M.C, Leprêtre, D.S, Demarquette, N.R, Lacrampe, M.F, Krawczak, P
Format: Article
Language:English
Subjects:
Amplitudes
Applied sciences
Chemical Sciences
Exact sciences and technology
Moisture content
molecular weight distribution/molar
Organic polymers
Physicochemistry of polymers
Polyethylene terephthalates
Polyethylenes
Polymers
Properties and characterization
Rheological properties
rheology
Rheology and viscoelasticity
Rheometers
Shear tests
Time delay
viscoelastic properties
viscosity
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Summary:In this work, the main factors affecting the rheological behavior of polyethylene terephtalate (PET) in the linear viscoelastic regime (water content, time delay before test, duration of experiment, and temperature) were accessed. Small amplitude oscillatory shear tests were performed after different time delays ranging from 300 to 5000 s for samples with water contents ranging from 0.02 to 0.45 wt %. Time sweep tests were carried out for different durations to explain the changes undergone by PET before and during small amplitude oscillatory shear measurements. Immediately after the time sweep tests, the PET samples were removed from the rheometer, analyzed by differential scanning calorimetry and their molar mass was obtained by viscometry analysis. It was shown that for all the samples, the delay before test and residence time within the rheometer (i.e. duration of experiment) result in structural changes of the PET samples, such as increase or decrease of molar mass, broadening of molar mass distribution, and branching phenomena.
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.31885