Summary
The stress relaxation behaviour of molten PMMA under large tensile deformations has been studied. Maximum values of the extension ratio were larger than 3.5. Similarly with previous results, the time dependence of the relaxing stress was found to be approximatively the same at all deformations. The deformation dependence was compared with the predictions of a theory byDoi andEdwards as well as with a modification of that theory which proves to agree better with the experimental results.
Zusammenfassung
Es wurde das Spannungsrelaxations-Verhalten von PMMA-Schmelzen unter großer Dehnbeanspruchung untersucht. Die maximalen Dehnungen waren dabei größer als 3,5. Ähnlich wie bei früheren Untersuchungen ergab sich die Zeitabhängigkeit der relaxierenden Spannung bei allen Deformationen als nahezu gleich. Der Deformationsverlauf wird mit den Voraussagen der Theorie vonDoi undEdwards, sowie denjenigen einer modifizierten Theorie verglichen. Es erweist sich, daß letztere die experimentellen Ergebnisse noch besser zu beschreiben vermag.
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Marrucci, G., de Cindio, B. The stress relaxation of molten PMMA at large deformations and its theoretical interpretation. Rheol Acta 19, 68–75 (1980). https://doi.org/10.1007/BF01523856
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DOI: https://doi.org/10.1007/BF01523856