Glass transition temperatures for simple molecular liquids and their binary solutions

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 T_g. In most cases, simple linear composition dependences are observed for T_g. The thermodynamic significance of dT_g/dx is discussed. In the case of cyclohexanol T_g estimated for the liquid exceeds the known value of "T_g" for the plastic crystal phase by some 10°C. The T_g estimated for CCl₄ and CHCl₃ exceed by large intervals the T_g values reported for vapor-deposited amorphous phases of these substances.