Synthesis and Thermal Stability of Cross-linked Carbazole-Substituted Poly(dimethylsiloxane) for LED Encapsulation

摘要

A series of carbazole substituted poly(dimethylsiloxane) (PDMS) was synthesized by hydrosilylation reaction of 9-vinyl carbazole into PDMS structure. It was then cross-linked with vinyl trimethoxysilane by condensation reaction. The fabricated product display increasing in refractive index with increasing carbazole content. The higher carbazole content also produce high thermal stability which is suitable for electronic device encapsulation applications. The modification also increases Tg of the polymers displayed by differential scanning calorimetry analysis. This behavior owes much to the carbazole moeity when it was successfully incorporated into PDMS chain.