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Scattering of Light by Two‐Dimensional Spherulites

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3 Author(s)
Clough, S. ; Polymer Research Institute, University of Massachusetts, Amherst, Massachusetts ; Van Aartsen, J.J. ; Stein, R.S.

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The low‐angle light scattering for anisotropic disks (representing two‐dimensional polymer spherulites) is calculated for the cases of (1) the optic axis lying in the plane of the disk and tilted at the angle β to the radius, (2) the optic axis rotating cylindrically about the radius through the angle ω while making a constant angle β to the radius where (a) ω rotates randomly and (b) ω varies linearly with the distance r from the center of the disk, and (3) affine deformation of the disk to an ellipsoid. For case (1) the scattering pattern is shown to rotate azimuthally through the angle β from that previously described where β=0° in agreement with experimental observations on polytetrafluoroethylene. Case (2) is shown to predict an azimuthal dependence of the wide‐angle scattering maxima of a type experimentally observed for banded spherulites. Case (3) predicts a deformation of the scattering pattern of a type observed for deformed polyethylene spherulites.

Published in:

Journal of Applied Physics  (Volume:36 ,  Issue: 10 )

Date of Publication:

Oct 1965

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