Abstract
Abstract FTIR spectroscopy is a powerful technique for detecting the structural variation of semicrystalline polymers. Here in this paper, we report the application of high resolution FTIR spectroscopy in the structural characterization of polyethylene and ethylene copolymers, including high density polyethylene (HDPE), ethylene-vinyl acetate copolymers (EVA), and their hydrolytic products (EVOH). For ethylene copolymers, high-resolution cryogenic FTIR spectroscopy revealed that there exist polymorphism phenomena and crystalline phase transformation as experimental temperature was changed; FTIR spectral study also showed that the hydroxyl groups of EVOH enter crystalline region, while the side branches of EVA copolymers exist predominantly in amorphous region. For HDPE, based on the results of high-resolution variable temperature FTIR spectroscopy, linear correlations between IR crystalline band (730/720 cm − 1 ) shifts and the variation of unit cell parameters of HDPE have been established.
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