Nonlinear Kinetic and Thermodynamic Properties of Monomeric Organic Glasses

Abstract

Thermodynamic Kauzmann temperatures, T K , published dielectric relaxation and viscosity Fulcher temperatures, T 0 , and nonlinear enthalpic Adam-Gibbs temperatures, T 2 AG , are compared for three isomeric indanes that differ only by the position of an aromatic methoxy group, and for o-terphenyl (OTP) and tri-R-naphthyl benzene (TNB). All three temperatures agreed to within estimated experimental uncertainty for all glasses, with one probable exception. Adam-Gibbs "primary" activation energies ∆µ of 1400, 1120, and 2750 kJ mol -1 were derived from the enthalpy relaxation parameters for the o-, m-and p-indanes, respectively, compared with the dielectric values of 900, 990, and 1040 kJ mol -1 . The enthalpy relaxation values of ∆µ for OTP and TNB were 940 and 545 kJ mol -1 , respectively.

A comparison of rheology, dielectric response, and calorimetry within indane-based glass-formers

“…Melting points have been provided for each sample in Table 1. Melting points for ortho, meta, and para methoxy-indanes have been previously measured [12,13] and stand in agreement with our measurements.…”

“…These measurements are typically a few degrees above the T g determined by OS and DS (see Table 1). All published values for the calorimetric T g agree within 4 K [12,13].…”

Comparison of glass formation kinetics and segmental relaxation in polymers

“…Note that results very similar to Eq. (5) can be obtained using an alternative function, proposed by Narayanaswamy and co-workers [50,55].…”

Communication: Enthalpy relaxation in a metal-organic zeolite imidazole framework (ZIF-4) glass-former

“…4 presents the correlations among m, β KWW , and x of the amorphous ZIF-4 and conventional melt-quenched glasses, in particular, the molecular glasses. 20,[25][26][27][28][29] Fig. 4(a) shows the β KWW -x correlation, and the data are all located below the line defined by x = β KWW , revealing a basic relation of x < β KWW .…”