Hybrid Bisphenol A non-isocyanate polyurethane composite with Mica powder: A new insulating material

Non-isocyanate polyurethanes (NIPU) or hydroxyurethanes from CO2 sourced monomers were prepared via a non-toxic route, which avoided the toxic isocyanate utilization with an excellent conversion ratio of cyclic carbonate, higher than 95%. The hybrid NIPU was prepared in the presence of aminosilylated-mica, used as reinforcement to improve mechanical properties, besides keeping the charge dissipation. The improvement of mechanical, thermal and electrical properties by silylated mica is attributed to higher crosslinking density in the organosilicate network. (attributed to the interfacial urethane linkage between the-NH2 on the surface of the mica and the cyclocarbonates). It has been demonstrated the feasibility to produce candidate materials for replacing epoxy-mica paper hybrid system by an alternative CO2 derived non-isocyanate hydroxyurethane-mica powder system. This system holds two advantages: CO2 long-term capture and a more simplified hybrid for-mation, since no vacuum pressure impregnation (VPI) is necessary, does resulting on lower energy consumption.

Automated summary

Non-isocyanate polyurethanes (NIPU) were prepared via a non-toxic route using CO2 sourced monomers, achieving excellent conversion ratio of cyclic carbonate. Aminosilylated-mica was used as reinforcement to improve mechanical properties and charge dissipation. The hybrid system showed improved mechanical, thermal, and electrical properties due to higher crosslinking density in the organosilicate network.