Relaxation Process Correlation by Glass Transition Temperature

4 Relaxation Process Correlation by Glass Transition Temperature 

The release and the oxidation processes of the encapsulated D-limonene are closely related to the structural changes in the capsule matrices. Physico-chemical changes caused by the phase transition of carbohydrate from amorphous glass to rubbery are commonly expressed with the temperature difference between the storage temperature, T, and the glass transition temperature, Tg, of the carrier matrices, T — Tg. The idea is based on the fact that the viscosity (or relaxation time) of the carrier matrices follows the Wflliams-Landel-Ferry (WLF) equation expressed as a function of T — Tg (Williams et al., 1955). Therefore, the release rate constants k and the oxidation rate 

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