The use of near infrared and far infrared spectroscopy for characterization of poly(ethylene terphtalate) films is discussed. After a brief review of previous work, some examples of transmission spectra of annealed PET, showing complex changes in the absorption bands, are presented. NIR spectra was used to follow the crystallinity (or conformation) of thick PET films without any sample preparation.
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G. Lachenal (1997) studied this question.
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