纳米二氧化硅表面接枝9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物以及对聚甲基丙烯酸甲酯复合材料阻燃性能和透明性的影响

聚甲基丙烯酸甲酯(PMMA)是一种重要的透明高分子材料,但是PMMA的易燃性限制了其应用。 本工作在纳米二氧化硅表面接枝含磷阻燃剂9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO),并用于聚甲基丙烯酸甲酯(PMMA)的改性。 极限氧指数(LOI)、垂直燃烧(UL-94)和锥形量热(CCT)测试结果表明,制备的PMMA复合材料的阻燃性能大幅度提高,这主要归因于纳米粒子和含磷阻燃剂的协同阻燃作用,形成致密的炭保护层结构。 同时,二氧化硅接枝DOPO的加入可以保持PMMA良好的透明性,这有利于材料在光学透明性要求较高的领域的应用。

Silica Grafted 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and Its Effect on Flame Retardancy and Transparency of Polymethyl Methacrylate Nanocomposites

Polymethyl methacrylate(PMMA) is one of important polymer materials with good transparency, but the poor flame retardancy of PMMA greatly limits its application. In this work, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO) was grafted onto the surface of silica nanoparticles that were employed to prepare PMMA nanocomposites. The results from limiting oxygen index(LOI), vertical burning(UL-94) and cone calorimeter test(CCT) indicate that the modified silica can effectively improve the flame retardancy of PMMA, which is mainly attributed to the synergistic effect between nanoparticles and phosphorous flame retardant to form compact protective carbon layer. Meanwhile, similar to pure PMMA, the as-prepared PMMA nanocomposites keep good transparency, which is positive to the wide applications of PMMA with high demand of optical transparency.