Journal of Physical Chemistry B 2012-04-05

Calorimetric study of glass transition in molecular liquids consisting of globular associates: dicyclorohexylmethanol and tricyclohexylmethanol.

Yasuhisa Yamamura, Yu-ta Suzuki, Masato Sumita, Kazuya Saito

Index: J. Phys. Chem. B 116(13) , 3938-43, (2012)

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Abstract

Heat capacities of liquids and liquid-quenched glasses (LQGs) of dicyclorohexylmethanol (DCHM) and tricyclohexylmethanol (TCHM) were measured by adiabatic calorimetry. Upon cooling the liquid compounds, they undergo glass transitions around 250 and 265 K, respectively. Temperature dependence of the FT-IR spectrum of TCHM liquid showed the gradual formation of dimers in the supercooled state with decreasing temperature. The magnitude of heat capacity jump at glass transition is discussed through a comparison with other low-molecular mass LQG. Combining the present results with previous heat capacity results on crystalline TCHM, residual entropies of LQG and standard thermodynamic quantities are established for both compounds.