The aim of this work is to evaluate the effect of different POSS compounds to act as flame retardants in epoxy mixtures for application in the aeronautic field. Four series of POSS: DPHPOSS, ECPOSS, GPOSS and TCPOSS were dispersed into an epoxy-amine mixture by ultrasonication and magnetic stirring. Visual assessment and optical microscopy were performed to analyze the dispersion/dissolution of POSS inside the epoxy formulation. Thermal degradation of POSS was found to be different for the four samples, whereas no significant differences were observed for the epoxy resins containing POSS compounds. Flame retardancy tested by the LOI indicated that GPOSS has meaningful effects on the flame retardancy of the epoxy mixture. The incorporation of 5 wt% GPOSS into epoxy matrix resulted in a LOI value 33 with respect to 27 of the pure epoxy mixture. The trend observed by LOI tests was confirmed by mass loss calorimetry measurements: a decrease from 540 kW/m2 to 327 kW/m2 was observed in the peak of heat release rate (PHRR)
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