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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 61,
  • Issue 3,
  • pp. 276-282
  • (2007)

Mixed Crystal Infrared Spectroscopy of Uniaxially Drawn Polyethylene Films

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Abstract

Blends of fully deuterated polyethylene with unlabeled polymer have been studied using Fourier transform infrared (FT-IR) spectroscopy. Melt quenched samples were drawn at 1 mm min<sup>−1</sup>, clamped, and cooled with liquid nitrogen. The CD<sub>2</sub> bending vibration is sensitive to the local molecular arrangement. Changes in band components were related to (1) crystallization of amorphous polymer; (2) the untwisting of spherulite ribbons perpendicular to the draw direction; and (3) coarse slip. Measurement of remaining doublet splittings enabled estimates of surviving crystallite block sizes to be made. In addition, CH<sub>2</sub> wagging and rocking bands showed evidence of increasingly defective crystals and of a Martensitic transformation to the monoclinic crystal form.

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