POSS/粘土/多壁碳纳米管杂化碳纳米纸基复合材料防火性研究

多壁碳纳米管(MWCNTs)、粘土和多面齐聚半硅氧烷(POSS)组成的杂化碳纳米纸是通过碳纳米管巴基纸制备工艺制备而成, 碳纳米纸可做为表面防火层与聚合物基复合材料共固化成型。利用场发射扫描电镜(FESEM)和BJH法分别对碳纳米纸和杂化碳纳米纸微观结构和平均孔径分布进行表征。利用锥形量热仪在热辐射功率50 kW/m²条件下分析外贴碳纳米纸复合材料及复合材料对比样的防火特性。燃烧实验结果表明: 碳纳米纸和杂化碳纳米纸作为防火层的复合材料的峰值热释放速率(PHRR)与复合材料对比样相比分别下降20.2%和35%, 同时CO释放量和烟释放量也明显降低。通过FESEM研究表明燃烧实验后外贴杂化碳纳米纸复合材料的燃烧残余物表面形成了一层致密的积炭物结构, 防火阻燃性能明显提高。

Fire Retardancy of Fiber Reinforced Polymer Composites Coated with POSS/Clay/MWCNTs Hybrid Buckypaper

A hybrid buckypaper consisting of multi-walled carbon nanotubes (MWCNTs), clay and polyhedral oligomeric silsesquioxane(POSS) was fabricated through vacuum filtration method. The as-prepared buckypaper (or hybrid buckypaper) can be incorporated onto the surface of fiber reinforced polymer composite as surface fire shields. The morphology and pore size distribution of the MWCNTs buckypaper were characterized with field emission scanning electron microscope (FESEM) and Barret-Joyner-Halenda(BJH) method. The fire retardant performance of composite laminates coated with (or without) the buckypaper was thoroughly evaluated by cone calorimeter testing at a radiant heat flux of 50 kW/m². Compared with the contral composite, the peak heat release rate (PHRR) of composite surface coated MWCNTs buckypaper or the hybrid buckypaper reduced more than 20.2% and 35%, respectively. The CO production rate and the smoke production rate reduced obviously. The formation of compact char material can be observed on the surface of the composite residues and analyzed by FESEM, the fire retardant property of composite can be improved by surface coated hybrid buckypaper.