Synthesis, crosslinking and flame retardance of polymers of boron-containing difunctional styrenic monomers

摘要

Two novel difunctional styrenic monomers - 2,2-bis(4-vinylbenzyl)propane-1,3-diol and 5,5-bis(4-vinylbenzyl)-2-phe-nyl-[1,3,2] dioxaborinane - were synthesized and copolymerized to test the influence of boron on the properties of materials. They were characterized by elemental analysis, mass spectrometry, FTIR and ~1H, ~(13)C NMR spectroscopy. The copolymers with boron showed higher thermal stability and char yields than polystyrene or homologous copolymers without boron. The thermal degradation of boron-containing styrenic polymers was studied by FTIR and boric acid was detected at high temperatures. LOI values increase with boron content.