Issue 8, 1991

Crystallinity of uniform oligo(oxyethylene) mono-n-alkyl ethers studied by X-ray diffraction and differential scanning calorimetry

Abstract

The crystallinity of two series of uniform oligo(oxyethylene) mono-n-alkyl ethers has been investigated: α-alkyl,ω-hydroxyoligo(oxyethylene)s, H(CH2)n(OCH2CH2)mOH, and α-alkyl,ω-methoxyoligo(oxyethylene)s, H(CH2)n(OCH2CH2)mOCH3. The hydroxy-ended oligomers formed bilayer crystals, and the methoxy-ended oligomers formed monolayer crystals. The helical oxyethylene blocks were oriented normal to the layer-crystal end-group plane, whilst the trans-planar alkyl blocks were generally tilted at an angle δ= 60°. The melting temperature and enthalpy of fusion were higher for hydroxy-ended oligomers than for corresponding methoxyended oligomers.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans., 1991,87, 1183-1186

Crystallinity of uniform oligo(oxyethylene) mono-n-alkyl ethers studied by X-ray diffraction and differential scanning calorimetry

J. R. Craven, Z. Hao and C. Booth, J. Chem. Soc., Faraday Trans., 1991, 87, 1183 DOI: 10.1039/FT9918701183

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