Philippoff, Wladimir (Committee chair)
Buteau, Leon Joseph (Committee member)
Huang, Ching-Rong (Committee member)
Date:
1974-06
Keywords:
Rheology
Photoelasticity
Polybutenes
Availability:
Unrestricted
Abstract:
This study presents quantitative experimental data on the various stress-optical characteristics of polymer liquids, specifically, polyisobutylene. Through the use of a concentric cylinder rheogoniometer and a rotational viscometer, the temperature effects of a newtonian polyisobutylene liquid. was studied and was found to have a stress-optical coefficient independent of shear stress and minor temperature changes. The experiments confirm that the birefringence is a known function of the extinction angle and the shear stress. Various polyisobutylene liquids were used in a simple flow device to observe the birefringence in the 1-3 plane and the 2-3 plane. The results indicate that the 1-3 birefringence is proportional to the molecular weight of the material. Contrary to theory, birefringence effects are observed in the 2-3 plane. The study also included, the transient behavior of a highly non-newtonian polyisobutylene solution. The most notable aspect of this behavior was that of an 'overshoot' effect, whose occurence and magnitude is a function of the shear rate.
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