Abstract
Thin uniaxially drawn poly(ethylene terephthalate) films (down to 0.1 μm thickness) were prepared. Their absorption spectra showed clear dichroism having peaks at 300 (⊥), 243 (//) and 197 nm (//). Analysis of the reflection spectra of thick films by means of the Kramers–Kronig conversion gave absorption spectra almost identical with those obtained from direct absorption measurement. Spectral shapes and possible origins of the vibrational structures were qualitatively discussed. The oscillator strength of each band was obtained on the simple oriented gas model with or without the Lorentz field correction to examine effects of molecular aggregation. PPP calculations with CI were made by use of a model compound, and four 1Ag→1Bu allowed transitions were predicted to occur at 4.66, 5.27, 6.33 and 6.44 eV. The latter two transitions were actually observed at 6.2 eV. The calculated transition moments suggested the existence of the cis form of carbonyl groups in oriented amorphous phases.
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Ouchi, I. Anisotropic Absorption and Reflection Spectra of Poly(ethylene terephthalate) Films in Ultraviolet Region. Polym J 15, 225–243 (1983). https://doi.org/10.1295/polymj.15.225
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