Abstract
The polymer orientation structure in rolled polypropylene sheets was studied by polarized-light microscopy, scanning electron microscopy, and wide-angle x-ray diffraction. The initial spherulites became deformed to a pancake shape as rolling deformation proceeded and became more perfectly aligned as the rolling procedure continued. Most polymer crystallites were oriented with theirb- axis nearly perpendicular to the rolling direction, as shown by x-ray pole figures. Even-order 〈Pn(cosχ)〉c coefficients of the Legendre polynomial series (n = 2 to 10) describing thec-axis or orientation distribution of the molecular chains were determined from measurements of polar angle scan using the transmission technique. The 〈P n 〉 c (n = 2 to 10) curves calculated from the pseudoaffine deformation theory agreed with the experimental data.
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Lee, W., Wu, S. & Song, M. Characterization of the orientation structure and distribution in rolled polypropylene. JMEP 5, 637–645 (1996). https://doi.org/10.1007/BF02646094
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DOI: https://doi.org/10.1007/BF02646094