Large Cyclic Poly(oxyethylene)s: Chain Folding in the Crystalline State Studied by Raman Spectroscopy, X-ray Scattering, and Differential Scanning Calorimetry
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Abstract
Crystalline cyclic poly(oxyethylene)s with number-average molar masses (Mn) of 4000, 6000, and 10000 g mol-1 were studied by wide-angle (WAXS) and small-angle (SAXS) X-ray scattering, high-frequency and low-frequency laser-Raman spectroscopy, and differential scanning calorimetry (DSC). The subcell of the crystalline cyclic polymers was the same as that of high-molar-mass poly(oxyethylene). Cyclic polymers of Mn = 4000 or 6000 g mol-1 crystallized in their twice-folded conformation under the conditions investigated, but the cyclic polymer of Mn =10000 g mol-1 crystallized in a four-times-folded conformation when cooled from its melt and in a twice-folded conformation when crystallized slowly at high temperature. Comparison is made with the properties of corresponding linear poly(oxyethylene) dimethyl ethers.
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