Linear polyborosiloxane for improving the flame-retardancy of cyanate ester resin
Materials Chemistry and Physics(2024)
摘要
The increasing demands for electronic packing materials necessitate stringent criteria for the overall properties of cyanate ester (CE) resins. In this work, a novel linear polyborosiloxane with a distinctive organic-inorganic hybrid Si-O-B backbone, featuring functional epoxy and phenyl groups (denoted as LPSi-B), was synthesized via a solvent- and catalyst-free one-pot polycondensation. Subsequently, the synthesized LPSi-B was co-crosslinked within the bisphenol A dicyanate ester (BADCy) thermoset network. The presence of abundant active epoxy groups in LPSi-B facilitated its involvement in the cyanate curing reaction, demonstrating excellent compatibility within the resin matrix. The resulting LPSi-B/BADCy composite not only exhibits outstanding mechanical properties but also demonstrates notable flame-retardant and dielectric characteristics. Specifically, the hybrid nature of LPSi-B, combining the flexibility of Si-O-B chains with the rigidity of side-chain phenyl groups, fosters intermolecular non-covalent π-π interactions directly linked to boron atoms, thus mitigating network polarization. Furthermore, the synergistic flame-retardant effect arising from boron and silicon components was harnessed to achieve halogen-free, phosphorus-free, and environmentally friendly fire safety outcomes. This innovative design ensures exceptional compatibility and interface bonding between LPSi-B and the polymer matrix, thereby endowing cyanate ester resin with superior comprehensive performance suitable for advanced applications in wave-transparent and electronic packing materials.
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关键词
Cyanate ester,Polyborosiloxane,Mechanical strength,Flame retardancy
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