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We computed by a modified tight binding approximation, the total electronicenergy of three different hybrid polymers: $H-SiO_2$, $CH_3-SiO_2$ and$C_6H_5-SiO_2$. We made the hypothesis that the structures of these polymersare amorphous. Computational results regarding the total electronic energy andexperimental data \cite{ferchichi} on the toughness of these three hybridpolymers were compared. A good qualitative agreement was found betweencomputations and experiments.

Total electronic energy by tight binding approximation and experimental toughness of three different hybrid polymers