Using differential scanning calorimetry (DSC), the relaxation transitions in interpenetrating polymer networks based on cross-linked polyurethane and linear poly(butylmethacrylate) in the presence of compatibilizing additives are investigated. Depending on the chemical nature of compatibilizing additives, their different influence on the structure of formed systems is observed. The analysis of temperature transitions and values of the heat capacity increments defined by DSC and the calculated fraction of interfacial regions have shown that the compatibilization leads to increasing the fraction of the interfacial regions depending on the ratio of components. The introduction of oligourethanedimethacrylate as an additive gives the single-phase networks. The interfacial region is absent in such systems.

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