Raman spectrum and vibrational assignment for poly(tetrafluoroethylene)
- 1 January 1970
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 2943-2947
- https://doi.org/10.1039/j19700002943
Abstract
The Raman spectrum of polytetrafluoroethylene has been recorded under various conditions of sample crystallinity and temperature. Depolarization data for a perfluoropropylene–perfluoroethylene copolymer have also been recorded. From these a complete vibrational assignment has been made. The bands at Δν= 576 and 597 cm–1 whose intensity varies markedly with temperature have been discussed, the former being assigned to the E1 CF2 rocking fundamental and the latter to the rocking of a CF2 group at a reversal in screw sense of the helical chains in the crystalline phase. The i.r.-active temperature-sensitive band at 625 cm–1 is assigned to the out-of-phase motion of the two chain segments on either side of such a point.Keywords
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