Synthesis and Thermal Stability of Crosslinked Carbazole-Substituted Poly(Dimethylsiloxane) for Led Encapsulation

A series of carbazole substituted poly(dimethylsiloxane) (PDMS) was synthesized by hydrosilylation reaction of 9-vinyl carbazole into PDMS structure. It was then crosslinked with vinyl trimethoxysilane by condensation reaction. The fabricated product increased in refractive index with increasing carbazole content. The higher carbazole content also produced high thermal stability with an increase in Tg and degradation temperature. This behaviour owe much to the carbazole moiety as well as the formation of crosslink network These features contribute to potential use as electronic devices encapsulants and coatings.