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The infrared spectra of urethane‐, urea‐, and semicarbazide‐linked aliphatic polyethers (poly(oxyethylene), poly(oxytetramethylene) and poly(oxypropylene)) have been measured at 300 K and 153 K. The assignment of the different structural units to certain groups of absorption bands (“characteristic band combinations”) was made by the evaluation of the spectra of reference compounds and of literature data. The low‐temperature effects (band splitting, shift of band maxima) facilitate the identification of structural units in these polymers. The observed effects do not signify crystallinity but beginning regularity of the poly(oxyethylene) and poly(oxytetramethylene) sequences.
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Hummel et al. (1979) studied this question.
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