POS6-0535
Controlled Synthesis of Solution-Processable Oligomeric Nano-Borosiloxane Resins with Enhanced Thermal Stability and Flame Retardancy
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
JIEON KIM (NationPusan al University)
Co-Author(s)
Abstract
Flame-retardant polymers are increasingly required for safer and more durable materials in electronics, battery systems, and aerospace applications. Siloxane-based polymers are attractive because of their flexibility, thermal resistance, and processability; however, their poor char integrity limits their effectiveness under severe flame exposure. Incorporating boron into siloxane networks is a promising approach to enhance ceramic-like char formation, but it remains synthetically challenging. In particular, only limited boron can be introduced, and the competitive formation of Si–O–Si and Si–O–B bonds often causes poor structural control, premature gelation, or phase separation. Thus, a controllable route for constructing boron-containing siloxane frameworks is essential for advanced flame-retardant materials.
Here, we report an oligomeric nano-borosiloxane resin containing transformable Si–O–B linkages. The resin was synthesized by controlled sol–gel condensation of organosilane and boronic acid derivatives, with reaction temperature, catalyst, and monomer ratio optimized to promote Si–O–B formation and structural uniformity. Successful synthesis of the borosiloxane oligomer was confirmed by FT-IR, NMR, and MALDI-TOF analyses. Owing to its oligomeric liquid nature, the resin exhibited liquid-state formability, enabling facile casting and shaping before curing. It was then UV-cured via thiol–ene click chemistry to obtain crosslinked borosiloxane films. Thermal stability, char morphology, and flame-retardant performance were evaluated using TGA, SEM, UL-94 vertical burning, limiting oxygen index, and cone calorimetry. Compared with conventional siloxane materials, the borosiloxane films showed improved thermal stability and flame retardancy due to a denser boron–silicon-containing protective char layer. These results demonstrate oligomeric nano-borosiloxane resins as a promising platform for liquid-processable, high-performance flame-retardant materials.
Here, we report an oligomeric nano-borosiloxane resin containing transformable Si–O–B linkages. The resin was synthesized by controlled sol–gel condensation of organosilane and boronic acid derivatives, with reaction temperature, catalyst, and monomer ratio optimized to promote Si–O–B formation and structural uniformity. Successful synthesis of the borosiloxane oligomer was confirmed by FT-IR, NMR, and MALDI-TOF analyses. Owing to its oligomeric liquid nature, the resin exhibited liquid-state formability, enabling facile casting and shaping before curing. It was then UV-cured via thiol–ene click chemistry to obtain crosslinked borosiloxane films. Thermal stability, char morphology, and flame-retardant performance were evaluated using TGA, SEM, UL-94 vertical burning, limiting oxygen index, and cone calorimetry. Compared with conventional siloxane materials, the borosiloxane films showed improved thermal stability and flame retardancy due to a denser boron–silicon-containing protective char layer. These results demonstrate oligomeric nano-borosiloxane resins as a promising platform for liquid-processable, high-performance flame-retardant materials.
