Abstract
Conformational behavior of short poly oxyethylene) (POE) chains in water has been studied by FT-IR spectroscopy. The spectra of aqueous solutions of CH 3(OCH 2CH 2) m OCH 3 with m = 2–6 were measured for various concentrations by using a horizontal ATR accessory. The observed spectra show that, with increasing water fraction, the population of the gauche conformation about the OCCO bond increases, but the direction of the conformational preference is reversed for lower concentrations. The observed maximum of the gauche population is interpreted as a consequence of anomalous enhancement of the gauche population in a specific concentration region. This effect is more significant for shorter POE chains. These observations suggest that there exist some specific interactions, which highly favor the gauche conformation of the OCH 2CH 2O segment, for limited composition regions of the binary systems of short POE chains and water.
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