Simultaneous Wide-Angle X-Ray Diffraction and Differential Scanning Calorimetry Analysis of the Melting and Recrystallization Behavior of Polyethylene and Isotactic Polypropylene Containing Cyclopentane Units in the Main Chain

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Abstract

The melting and crystallization behavior of polyethylene and isotactic polypropylene containing 1,2- or 1,3-disubstituted cyclopentane units in the main chain has been studied with simultaneous wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry. For the ethylene-based copolymers, the position of a reflection peak in the WAXD patterns shifts to a low angle with the increasing acquired temperature. The temperature dependence on the axial length of the crystal lattice is more marked in the copolymers forming orthorhombic crystals (containing 1,2-cyclopentane or 5.6 mol % 1,3-cyclopentane units) than in those forming hexagonal crystals (containing 8.1 mol % 1,3-cyclopentane units). For the isotactic propylene-based copolymers, the position of the reflection peaks in the WAXD patterns is independent of the acquired temperature. The proportion of the γ form in the copolymer containing the 1,2-cyclopentane units is higher than that in the copolymers containing the 1,3-cyclopentane units.

Original languageEnglish
Pages (from-to)1457-1465
Number of pages9
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume42
Issue number8
DOIs
Publication statusPublished - 2004 Apr 15

Keywords

  • Cyclopentane unit
  • Differential scanning calorimetry (DSC)
  • Poly(propylene) (PP)
  • Polyethylene (PE)
  • Wide-angle X-ray diffraction (WAXD)

ASJC Scopus subject areas

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

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