Thermal and radiation stability of POSS by the presence of hydrocarbon substituents

The thermal and radiation stabilities of POSS modified with various hydrocarbon substituents are studied by chemiluminescence. The material answers are different in relation with the electronic densities that exist in the modified structures. The oxidative degradation achieved at four γ-doses: 0, 25, 50 and 100 kGy present unlike behavior, because the substituents interact with the frame of silsesquioxanes and the scission of –Si–O–moieties exhibit different levels. The comparison of nonisothermal spectra reveals the generation of hydroperoxides at two different temperatures that demonstrates the induction of degradation by means of the variation of electronic densities.