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将1-氧代-4-羟甲基-1-磷杂-2,6,7-三氧杂双环[2.2.2]辛烷(PEPA)与丙烯酰氯反应,制备了PEPA丙烯酸酯(PEPA-AA),通过1 H-NMR确认了产物结构。研究了不同比例的PEPA-AA与γ―甲基丙烯酰氧基丙基三甲氧基硅(KH-570)共聚苯乙烯的燃烧性和热稳定性。结果表明,磷-硅之间有明显的协同阻燃作用,当PEPA-AA∶KH-570∶St为15∶10∶75(mol∶mol∶mol)时,共聚苯乙烯的极限氧指数(LOI)可达28.5%。热重分析(TGA)显示,该共聚物在氮气下热分解后600℃残余物含量为31.3%,在空气中热氧化分解后600℃残余物含量为36.6%,表现出凝聚相阻燃的特点。
PEPA acrylate (PEPA-1) was prepared by reacting 1-oxo-4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo [2.2.2] octane (PEPA) AA), the product structure was confirmed by 1 H-NMR. The flame retardancy and thermal stability of copolymerized polystyrene with different proportions of PEPA-AA and γ-methacryloxypropyltrimethoxysilane (KH-570) were studied. The results showed that there was a synergistic flame retardant effect between phosphorus and silicon. When PEPA-AA: KH-570: St was 15:10:75 (mol: mol: mol), the limiting oxygen index LOI) up to 28.5%. Thermogravimetric analysis (TGA) showed that the copolymer had a residue content of 31.3% after thermal decomposition under nitrogen at 600 ° C and a residual content of 36.6% at 600 ° C after thermal oxidative decomposition in the air, showing the characteristic of flame retardancy of the condensed phase .