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- Title
Vibrational Spectra of Poly(ethylene terephthalate) Chains in the Mesomorphic Form.
- Authors
Rizzo, Paola; Trotta, Diletta; Musto, Pellegrino; Guerra, Gaetano
- Abstract
Abstract: Vibrational (infrared and Raman) spectra of poly(ethylene terephthalate) (PET) chains included in the mesomorphic phase, as established by X‐ray diffraction patterns, are compared with spectra of corresponding amorphous and crystalline (triclinic) phases. The study indicates the presence of similar amounts of amorphous phase in semicrystalline and mesomorphic films. For the mesomorphic phase, occurrence of extended linear chains with disordered conformation, which was suggested by combination of X‐ray diffraction data and conformational analysis, is confirmed. In particular, a detailed analysis of conformationally sensitive spectral regions confirms the presence of sequences with <italic>trans</italic> OCCO dihedral angles and <italic>trans</italic> or <italic>gauche</italic> COCC dihedral angles. The reported analysis also allows discriminating between crystalline peaks corresponding to vibrational modes of long or short <italic>trans</italic>‐planar PET stretches.
- Subjects
POLYETHYLENE terephthalate; VIBRATIONAL spectra; RAMAN spectra; AMORPHOUS substances; THIN films
- Publication
Macromolecular Chemistry & Physics, 2018, Vol 219, Issue 3, p1
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201700362