Uniform triblock oligomers with a central methylene block and outer oxyethylene blocks terminated by methoxy groups, CH3(OCH2CH2)mO(CH2)n(OCH2CH2)mOCH3 (EmCnEm), were prepared and studied in the solid state by X‐ray diffraction, differential scanning calorimetry and Raman spectroscopy. Both fully crystalline and partly‐crystalline structures were found, with chains in wholly trans‐planar and mixed‐trans‐planar/helical conformations. Comparison is made with previous results for triblock oligomers of type CnEmCn and diblock oligomers of type CnEm.
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Campbell et al. (1993) studied this question.
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