Infra-red spectra and optical constants of polytetrafluoroethylene films

Transmission and reflection infra-red spectroscopy were used to determine refractive indices in thin films of poly(tetrafluoroethylene) and poly(tetrafluoroethylene-hexafluoropropylene) over the range 2200 to 800 cm −1. The results showed the expected pattern over the strong absorption region but th...

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Bibliographic Details
Published in:Polymer (Guilford) 1986-04, Vol.27 (4), p.503-509
Main Authors: Afanas'eva, N.I., Brame, E.G., Lockshin, B.V., Yakovlev, V.A.
Format: Article
Language:English
Subjects:
Applied sciences
dielectric constant
Electrical, magnetic and optical properties
Exact sciences and technology
infra-red spectroscopy
Organic polymers
Physicochemistry of polymers
polytetrafluoroethylene
Properties and characterization
reflection spectra
refractive index
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Summary:Transmission and reflection infra-red spectroscopy were used to determine refractive indices in thin films of poly(tetrafluoroethylene) and poly(tetrafluoroethylene-hexafluoropropylene) over the range 2200 to 800 cm −1. The results showed the expected pattern over the strong absorption region but they also showed that film anisotropy exhibits a significant effect on the measurements. In addition, a calculation of the real and imaginary dielectric constants was performed on one of the thin films of poly(tetrafluoroethylene) to validate the refractive index measurements. The real dielectric constant curve showed an unexpected dip below zero on the high frequency sides of the two strong absorption bands. This suggests that surface excited waves may be observed under restricted conditions for films of poly(tetrafluoroethylene) and its copolymers.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(86)90233-8