The thermal stability polyperoxide-PEtOx blends were studied before and after crosslinking by TGA. The TG profiles of the polymer blends before (red) and after crosslinking (blue) show clear differences (Figure ). The degradation process consists of various stages. For the crosslinked sample, a minor mass loss of about 3% below ca. 100 °C can be attributed to physically adsorbed water (Fig. ). In contrast, the non-crosslinked sample shows a more pronounced mass loss of % between 50 °C to 180 °C, which is absent for the crosslinked one. As previously discussed, this is attributed to decomposition of the peroxide groups and evaporation of resulting tert-butanol (Figure ). Further mass loss (from 180 °C to 410 °C) is observed and can be attributed in part to the decomposition of the MA groups . While the absence of decomposition < 200 °C in the crosslinked blend confirm complete decomposition of the peroxides, the thermal stability of the blend was otherwise not significantly improved by the crosslinking. The DSC thermogram of pure PEtOx showed a Tg at 60.5 °C (Figure ) while this value was shifted to higher temperature (69.5 °C) for the crosslinked PEtOx, corresponding to lower chain segment mobility as expected after crosslinking.