Infrared and Raman spectra of polyethylene oxide in the low frequency region

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Abstract
The far infrared and Raman spectra of polyethylene oxide (PEO) between 5 and 150 cm−1 has been measured for three crystalline samples with different degrees of polymerization. Lines are observed at 37, 52, 81, and 107 cm−1 in the infrared and at 37, 56, and 78 cm−1 in the Raman spectrum. Theoretical calculations show that the 81 and 107 cm−1 lines are assignable to the torsional motion of the PEO helical chain about the C–O bond. The absorptions at 37 and 52 cm−1 have not been previously reported or predicted by any normal mode calculations of the isolated 7/2 helix although they seem to arise from intramolecular rather than lattice vibrations.