Glass transition temperatures have been measured at 20 mol % intervals in 55 binary molecular liquid systems and the results used as a basis for (a) estimating by extrapolations the glass transition temperatures of many common organic liquids which do not vitrify in the pure state and thereby (b) identifying the various structural features of a molecule which collectively determine the magnitude of its Tg. In most cases, simple linear composition dependences are observed for Tg. The thermodynamic significance of dTg/dx is discussed. In the case of cyclohexanol Tg estimated for the liquid exceeds the known value of "Tg" for the plastic crystal phase by some 10°C. The Tg estimated for CCl4 and CHCl3 exceed by large intervals the Tg values reported for vapor-deposited amorphous phases of these substances.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry