Abstract
The heat capacity of structure I ethylene oxide clathrate hydrate EO-6.86 H2O was measured in the temperature range 6–300 K with an adiabatic calorimeter. The temperature and enthalpy of congruent melting were determined to be (284.11 ± 0.02) K and 48.26 kJ mol−1, respectively. A glass transition related to the proton configurational mode in the hydrogen-bonded host was observed around 90 K. This glass transition was similar to the one observed previously for the structure II tetrahydrofuran hydrate but showed a wider distribution of relaxation times. The anomalous heat capacity and activation enthalpy associated with the glass transition were almost the same as those for THF-hydrate.
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Dedicated to Dr D. W. Davidson in honor of his great contributions to the sciences of inclusion phenomena.
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Yamamuro, O., Handa, Y.P., Oguni, M. et al. Heat capacity and glass transition of ethylene oxide clathrate hydrate. J Incl Phenom Macrocycl Chem 8, 45–58 (1990). https://doi.org/10.1007/BF01131287
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DOI: https://doi.org/10.1007/BF01131287