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 language | English |
|---|---|
| Pages (from-to) | 1457-1465 |
| Number of pages | 9 |
| Journal | Journal of Polymer Science, Part B: Polymer Physics |
| Volume | 42 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2004 Apr 15 |
| Externally published | Yes |
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