Abstract
The shear-induced structure of a semidimute solution of ultrahigh molecular weight polyethylene (UHMWPE) with a paraffin wax as a solvent was investigated with shear small-angle light scattering (shear SALS) and shear microscopy. At a temperature of 124 °C, which is much higher than the nominal melting temperature (∼118 °C) and is approximately equivalent to or slightly lower than the equilibrium dissolution (crystal melting) temperature of the UHMWPE solution at quiescent state, the characteristic “butterfly” pattern was observed in shear SALS when the solution was subjected to shear flow at a shear rate larger than critical shear rate γc,butt. Lack of optical anisotropy in the sheared solution and disappearance of the butterfly pattern after cessation of the shear suggest that the pattern is attributed to shear-enhanced concentration fluctuations or phase separation. When γ further increased above a critical value γc,streak, a strong, sharp streaklike scattering pattern appeared perpendicular to the ...
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