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The relaxation dynamics and thermodynamic properties of supercooled andglassy gambogic acid are investigated using both theory and experiment. Wemeasure the temperature dependence of the relaxation times in three polymorphs(alpha-, beta-, and gamma-form). To gain insight into the relaxation processes,we propose a theoretical approach to quantitatively understand nature of thesethree relaxations. The alpha-relaxation captures cooperative motions ofmolecules while the beta-process is mainly governed by local dynamics of asingle molecule within the cage formed by its nearest neighbors. Based onquantitative agreement between theory and experimental data, our calculationsclearly indicate that the beta-process is a precursor of the structuralrelaxation and intramolecular motions are responsible for the gamma-relaxation.Moreover, the approach is exploited to study effects of the heating process onalpha relaxation. We find that the heating rate varies logarithmically with Tgand 1000/Tg. These variations are qualitatively consistent with many priorstudies.

Molecular relaxations in supercooled liquid and glassy states of  amorphous gambogic acid: dielectric spectroscopy, calorimetry and theoretical  approach