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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 63,
  • Issue 11,
  • pp. 1303-1307
  • (2009)

Intermediate States in the Melting Process of Low Molecular Weight Poly(ethylene oxide)

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Abstract

The melting behavior of low molecular weight poly(ethylene oxide) (PEO) fractions has been studied via generalized two-dimensional infrared (2D-IR) correlation spectroscopy and a new stochastic-pulse-based temperature modulation differential scanning calorimetry (DSC) technique (TOPEM<sup>®</sup>). 2D-IR correlation analysis of the melting of PEO shows that ν<sub>s</sub>(CH<sub>2</sub>) and γ<sub>a</sub>(CH<sub>2</sub>) vary prior to ν<sub>s</sub>(COC). Moreover, the TOPEM<sup>®</sup> experiments show that reversible melting and crystallization is occurring during the melting of PEO. These suggest that the melting of PEO is possibly a process passing over intermediate states. Based on our results, a model of the melting process of PEO lamellae is presented: the intermediate states containing the distorted helical conformation are formed first at the front of the lamellae during the melting process.

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