Raman Spectra of Polyethylenes

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Abstract
Raman spectra of normal and deuterated polyethylenes in the solid and liquid states were obtained. Tentative assignments for (CD2) n are made using the Teller—Redlich product rule and Krimm's isotopic frequency rule. Interactions between the CD2 deformation and the symmetrical C–C stretching modes of species Ag, and between the CD2 wagging and the asymmetrical C–C stretching modes of species B 2g , are considered. Depolarization ratios for melt spectra successfully identified the symmetric modes only in the neighborhood of the CH2 stretching bands of (CH2) n . The Raman spectrum of molten (CH2) n includes bands at 1080 and 1303 cm—1, at which frequencies ``amorphous'' bands are observed in the infrared spectrum of the solid.

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