THE DEPENDENCE OF LIGHT SCATTERING BY POLYMER FILMS ON POLARIZATION ANGLE, AND ITS RELATIONSHIP TO THE RANDOMNESS OF ORIENTATION FLUCTUATIONS.
MASSACHUSETTS UNIV AMHERST POLYMER RESEARCH INST
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A theory for scattering from polymer films having nonrandom-orientation fluctuations is presented that involves a parameter epsilon, that varies between 1 for rodlike orientation correlations and - 1 for disklike correlations. A value of epsilon 0 corresponds to random correlations where the probability of optic axes being parallel is independent of the relative orientation of the axes and their line of separation. This is the previous case of random-orientation fluctuations that have been previously treated and that lead to correlated regions within the polymer having average spherical shape. The variation of the scattering with the angle characterizing the orientation of a polarizer in the incident light beam is found to depend upon the parameter epsilon. Intensity variations are calculated for the cases where an analyzer in the scattered beam has its depolarization direction either parallel or perpendicular to that of the polarizer. This approach is useful for describing the morphology of a crystalline polymer with organization less than that of a spherulitic polymer but greater than random. Author