In the course of the formulation of coated dosage forms, the selection of the suitable composition of the coating system is
of great importance in respect of the final dosage form. Since the applied coating systems are multicomponent, the possible
interactions between the components determine the physico-chemical stability of the formulated dosage form, the drug release
process, as well as the formulation parameters. In the present study, the influence of the applied plasticizer, dibutyl sebacate
on the enthalpy relaxation of casted Eudragit L 30D films was determined as a function of the plasticizer concentration. The
enthalpy relaxation was recorded by DSC during the applied isothermal recovery process of Eudragit films. The obtained results
indicate that enthalpy relaxation can be measured by DSC at 20 mass/mass% dibutyl sebacate concentration, which refers to
the increased molecular mobility consequently to the effect of the interaction between the polymer and plasticizer.