Crystallinity of ethylene oxide oligomers |
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Authors: | A Marshall RC Domszy HH Teo RH Mobbs C Booth |
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Institution: | Department of Chemistry, University of Manchester, Manchester M13 9PL, England |
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Abstract: | Nonaethylene glycol and pentadecaethylene glycol and their dimethyl ethers have been prepared and characterized, with respect to crystallinity by wide- and small-angle X-ray scattering, Raman scattering, i.r. spectroscopy and differential scanning calorimetry. Wide-angle X-ray scattering is similar to that from high molecular weight poly(ethylene oxide). The crystal habit is lamella. The lamellae are highly crystalline and the surface layers are ordered. Comparison with crystalline poly(ethylene oxide) prepared conventionally, and having a distribution of chain lengths, shows that such samples crystallize into lamellae with disordered surface layers. |
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