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

Abstract

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.

A novel carbazole based bismaleimide monomer: Synthesis, characterization, thermal and optical properties

“…Structures containing conjugated carbazole moieties are known to have high thermal stability and are suitable for electronic devices. 35,49 The thermal behavior of Cz-BisMI was investigated by DSC and the results were compared with 4,4 -bismaleimidophenylmethane (DPM-BisMI) as a commercial bismaleimide monomer. Figure 2 shows the DSC curves of bismaleimides (BisMIs), including the results of the melting points (T m ), the onset temperature for the curing reactions (T 1 ), the maximum temperature of polyexotherm values (T p ), and the processing windows (T 1 -T m ; as measured according to the literature) 7,50 were listed in Table 2.…”

“…It is soluble in many organic solvents and has unique photo-and electrochemical properties that allow it to exhibit ideal optical properties, strong luminescence emissions, 31,32 and also unique conductivity. 33 In recent years, carbazole compound has received great attention in optoelectronic applications for the production of photoconductive, electroluminescent, and photorefractive materials, [33][34][35] thus its derivatives have been designed in the process of the manufacture of optoelectronic devices such as light emitting diodes, 35 photovoltaic devices, 36 sensors, 37 and optical waveguides. 38 In the literature, carbazole groups have been incorporated onto the backbones of aromatic polyamide and polyimide structures to provide and enhance the electronic and photophysical properties of the resulting products.…”

“…It was aimed to produce a new bismaleimide monomer with good thermal stability, optimum solubility, and unique optical properties due to having carbazole content for the development of opto-electronic materials. Although various carbazole derivatives have been designed and synthesized for opto-electronic devices over the past few decades, [35][36][37][38] Cz-BisMI would be a notable monomer, providing a basis for the use of a bismaleimide monomer in applications of opto-electronic materials. In the continuation of the study, the Cz-BisMI monomer was used to produce a new poly(bismaleimide): P(Cz-BisMI)s by the process of self-polymerization performed through with maleimide groups.…”