The application of the spectral subtraction routine to an analysis of the CH2 rocking mode of polyethylene single crystals is discussed. A difference band at 716 cm−1 characteristic of a local monoclinic arrangement of chains is detected. Oxidation of crystal mats by nitric acid indicates that these defect structures are located inside the crystal and are not associated with the fold surface.
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Painter et al. (1977) studied this question.
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