The crystallization characteristics of the binary system polyoxyethylene (PEO)‐glutaric acid were determined. From the extrapolated melting point depression data the heat of fusion for PEO is 2506 ± 200 cal/mole of repeat unit while the heat of solution for the glutaric acid amounts to 6.7 ± 1.2 cal/cm3. A melting point of 348 K is found for the high‐molecular‐weight PEO. A calorimetric glass‐transition temperature for mixtures of the two components is relatively independent of the melt composition and appears at 217 K. A eutectic is observed whose composition and melting temperature depend on the nature of the PEO crystal phase.
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Gryte et al. (1979) studied this question.
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