Abstract
The phenomenon of shear-thickening has been investigated for solutions of several high molecular weight crystallizable polymers using capillary rheometry. The systems studied: polyethylene/xylene, polypropylene/tetralin, and poly(ethylene oxide)/ethanol have previously been investigated for their flow induced crystallization behavior. A shear-thickening pattern occurs in the relative viscosity vs. shear rate flow curves for the first two systems which, for the former of the two, also shows a strong molecular weight dependence. For the range of conditions studied, the poly(ethylene oxide)/ethanol system did not show shear-thickening, exhibiting instead a shear thinning pattern for the lower molecular weight sample studied and a constant viscosity high shear plateau for the higher MW system. The conclusion is reached that shear-thickening is due to molecular entanglements formed during flow and the implications of these results to the phenomenon of precursor phase separation in flow-induced fibrous crystallization are discussed.
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