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采用聚磷酸铵(APP)与纳米SiO_2阻燃水稻秸秆/高密度聚乙烯(HDPE)木塑复合材料,通过力学性能、极限氧指数、垂直燃烧、热重分析(TGA)和扫描电镜等研究了复合材料的界面,力学,阻燃性能及热降解行为。研究结果表明,当添加17%(wt,质量分数,下同)的APP与3%的纳米SiO_2时达到V-0级,极限氧指数提高了30.8%。拉伸强度提高了42.8%,弯曲强度提高51.9%,冲击强度提高了73.9%。TGA与SEM研究表明,APP与纳米SiO_2对木塑复合材料具有阻燃协效效应,APP使秸秆粉碳化同时膨胀发泡,纳米SiO_2加固炭层是阻燃的主要原因。
Adopting ammonium polyphosphate (APP) and nanosilica flame retardant rice straw / high density polyethylene (HDPE) wood plastic composites, the mechanical properties, limiting oxygen index, vertical burning, TGA and SEM Composites interface, mechanics, flame retardancy and thermal degradation behavior. The results showed that when the content of V-0 was reached by adding 17% (wt, mass fraction) APP and 3% nano-SiO 2, the limit oxygen index increased by 30.8%. Tensile strength increased by 42.8%, bending strength increased by 51.9%, impact strength increased by 73.9%. The results of TGA and SEM show that APP and nano-SiO_2 have a flame-retardant synergistic effect on wood-plastic composites. APP makes carbonization of straw powder expand and foam at the same time. Carbon nano-SiO 2 is the main reason of flame retardant.