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Large Amplitude Oscillatory Shear Induces Crystal Chain Orientation In Velocity Gradient Direction

K. Sreenivas, Guruswamy Kumaraswamy
Published 2014 · Materials Science

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Imposition of large amplitude oscillatory shear (LAOS) on crystallizing polymer melts results in lamellar orientation in the shear gradient direction, in contrast to the flow-orientation observed for steady shear. LAOS enhances the formation of plate-like nuclei and orients their normals in the gradient direction. An Arrhenius temperature dependence (with activation energy ≈ 226 kJ/mol) characterizes the relaxation of crystal orientation with annealing.
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