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^®). 2D-IR correlation analysis of the melting of PEO shows that ν_s(CH₂) and γ_a(CH₂) vary prior to ν_s(COC). Moreover, the TOPEM^® 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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