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Light Scattering from Crystalline Superstructure in Tubular-Extruded Poly(1-butene) Films. II. Analysis of Interparticle Interference Effect Based upon a Paracrystal Model

Light scattering from poly(1-butene) films prepared by tubular extrusion was studied in order to investigate its crystalline superstructure developed by the crystallization from oriented melts. Analysis of the light-scattering patterns together with electron micrographs indicates the existence of a row-nucleated crystalline superstructure whose rows are preferentially oriented at angle ±α0 with respect to the extrusion (ED). The lamellar overgrowth from the nuclei gives a sheaflike crystalline superstructures aligned regularly along the nuclei and nearly side by side with their axes preferentially oriented perpendicular to the ED. The depolarized and polarized components of scattered light from such assembly of the sheaves were analyzed in terms of a paracrystal model of Hosemann type. The analyses have yielded information on (i) average size of the sheaf, (ii) average intersheaf distance and its paracrystalline disorder, and (iii) average orientation of the row nuclei.