High-performance boron-containing phthalonitrile resins

Phthalonitrile resins as a unique class of high-performance materials have attracted increasing interest in wide application fields including aerospace, electronic packaging and flame-retardant materials. In this article, the boron element was incorporated into phthalonitrile resins to improve the processibility and thermal stability. The synthetic borate and aryl borate-modified resorcinol-based phthalonitrile monomers ( BPN and PBPN ) showed lower melting points than traditionally employed RPN . The presence of hydroxyl groups leads to autocatalytic curing behavior of BPN and PBPN . Due to the presence of the boron-branched structures in the polymer backbone of the modified phthalonitrile resins, these resins exhibited better thermal stability than traditionally investigated RPN and their mechanical properties are stable over a wide temperature range, which is crucial in service under harsh environments. The results suggest that boron-modified phthalonitrile resins possess great potential in the field of high-temperature resistant materials. Boron-containing phthalonitrile resins with good thermal stability, good flame retardancy and good thermo-mechanical properties.