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Dendritic hydrosilated network with exceptional thermo-oxidative stability containing POSS and carborane nanoclusters was synthesized from octasilane-POSS (1) and vinyl-terminated carboranylenesiloxane (2). A variant of the product, containing additional structurally reinforcing SiOSi bonds, was formed by the concomitant hydrosilation between 1 and 2 and the oxidation/hydrolysis/condensation reaction of a stoichiometric excess of 1 in the presence of the Karstedt catalyst, and triethylamine and water cocatalysts. The enhanced thermal and thermo-oxidative stabilities and structural rigidity of the reinforced network containing the additional SiOSi bonds were reflected in its higher char yields and storage/loss moduli.
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Kolel‐Veetil et al. (2008) studied this question.
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