A bimodal structure of solution‐grown isotactic polypropylene with orthogonally crossed lamellae

Isao Masada, Takumi Okihara, Shozo Murakami, Masayoshi Ohara, Akiyoshi Kawaguchi, Ken‐Ichi ‐I Katayama

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Isotactic polypropylene (iPP) was crystallized from solution on a uniaxially‐oriented iPP film. Small‐angle x‐ray scattering patterns obtained from the sample showed two perpendicularly crossed lameliae 9.3 nm thick that overgrew flat‐on and edge‐on on the substrate. In the through wide‐angel x‐ray diffraction pattern (taken with incident x‐rays normal to the iPP film surface), strong hkO reflections were arranged in an hkO net pattern indicating that the a‐axis of the monoclinic α unit cell was oriented parallel to the chain direction of the substrate. From this, it was concluded that the flat‐on lamellae grew with the a‐axis parallel to the chain axis of the substrate and with the b‐axis parallel to its surface. In the edge wide‐angle x‐ray diffraction pattern (X‐rays incident on the edge of the film), arced, strong 110 and 220 reflections from overgrown crystals were observed on the equator of the fiber pattern of the substrate. This indicated that the edge‐on lamellae epitaxially grew with the c‐axis aligned parallel to the chain axis of the substrate. The homoepitaxy explains the correlated growth mode between the orthogonally crossed lamellae: they grew epitaxially, the a‐axis of one lamella coinciding with the c‐axis of the other and the {010} planes in contact. © 1993 John Wiley & Sons, Inc.

Original languageEnglish
Pages (from-to)843-852
Number of pages10
JournalJournal of Polymer Science Part B: Polymer Physics
Volume31
Issue number7
DOIs
Publication statusPublished - Jun 1993
Externally publishedYes

Keywords

  • polypropylene, isotactic, with crossed lamellae, bimodal structure of
  • x‐ray diffraction of isotactic polypropylene with perpendicularly crossed lamellae

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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