Characterization of the orientation structure and distribution in rolled polypropylene

Wing Bun Lee, S. Z. Wu, M. S. Song

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


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 their b-axis nearly perpendicular to the rolling direction, as shown by x-ray pole figures. Even-order 〈Pn(cosX)〉c coefficients of the Legendre polynomial series (n = 2 to 10) describing the c-axis or orientation distribution of the molecular chains were determined from measurements of polar angle scan using the transmission technique. The 〈Pn〉c (n = 2 to 10) curves calculated from the pseudoaffine deformation theory agreed with the experimental data.
Original languageEnglish
Pages (from-to)637-645
Number of pages9
JournalJournal of Materials Engineering and Performance
Issue number5
Publication statusPublished - 1 Jan 1996


  • Orientation distribution
  • Orientation structure
  • Polypropylene

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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