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Thermal Phase Transitions of Carbon Monoxide–Ethylene Alternating Copolymer: An FT/IR Study
Author(s) -
De Vito Silva,
Ciardelli Francesco,
Benedetti Enzo,
Bramanti Emilia
Publication year - 1997
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199702)8:2<53::aid-pat616>3.0.co;2-t
Subject(s) - copolymer , materials science , carbon monoxide , differential scanning calorimetry , ethylene , infrared , infrared spectroscopy , fourier transform infrared spectroscopy , monoxide , intermolecular force , amorphous solid , polymer chemistry , chemistry , chemical engineering , polymer , organic chemistry , molecule , thermodynamics , catalysis , physics , composite material , engineering , optics , metallurgy
In this study an analysis of the changes that occur in the infared spectrum of the ethylene–carbon monoxide alternating copolymer as a function of the temperature is presented. This copolymer can assume two polymorphic crystalline states, named POK‐α and POK‐β. Fourier transform infrared spectroscopy seems to be a good technique to observe the transition between these two forms, which occurs between 120 and 140°C in an undrawn sample. The IR results have been supported by differential scanning calorimetry measurements. The data obtained have, also, clarified that in the solid state the structure of the ethylene–carbon monoxide copolymer is extended by strong intermolecular interactions that weaken its intrinsic resistance and aid its thermal degradation. These interactions are absent or at least less strong in the melt or in the amorphous state. © 1997 John Wiley & Sons, Ltd.