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为提高苎麻织物作为复合材料增强体时的阻燃性能,首先,采用层层组装法在苎麻织物表面构筑了氨基化多壁碳纳米管(MWCNT)-聚磷酸铵(APP)与聚乙烯亚胺(PEI)-APP膨胀阻燃多层膜;然后,将改性后的苎麻织物与苯并噁嗪树脂复合制备了苎麻织物/苯并噁嗪树脂层压板,并研究了层压板的热降解行为、阻燃性能与力学性能。结果表明:与纯苎麻织物/苯并噁嗪树脂层压板相比,含MWCNT-APP与PEI-APP膨胀阻燃多层膜的层压板热释放速率峰值由106.6 W·g-1降低至53.4 W·g-1和53.0 W·g-1,总热释放量由12.3kJ·g-1降低至7.6kJ·g-1和9.0kJ·g-1,极限氧指数由23.5提高至27.2和27.0,UL94级别由无级别提高至V-0和V-1级,弯曲强度由81 MPa提高至122 MPa和143 MPa,弯曲断裂伸长率由1.2%提高至1.4%和1.7%,拉伸性能也得到了一定的改善。所得结论表明使用MWCNT-APP与PEI-APP膨胀阻燃多层膜可在提高层压板阻燃性能的同时,改善其力学性能。
In order to improve the flame retardancy of ramie fabric as reinforcements for composite materials, firstly, a series of assembly methods were used to fabricate the poly (ethyleneimine) (APCNT) on the surface of ramie fabric. (PEI) -APP intumescent flame retardant multilayer film. Then, the ramie fabric / benzoxazine resin laminate was prepared by compounding the modified ramie fabric with benzoxazine resin, and the thermal degradation behavior of the laminate , Flame retardant and mechanical properties. The results show that the peak heat release rate of the laminates containing MWCNT-APP and PEI-APP intumescent flame retardant multilayer films decreases from 106.6 W · g-1 to 53.4 W, compared with pure ramie fabric / benzoxazine resin laminates · G-1 and 53.0 W · g-1 respectively, the total heat release decreased from 12.3kJ · g-1 to 7.6kJ · g-1 and 9.0kJ · g-1, the limiting oxygen index increased from 23.5 to 27.2 and 27.0, The UL94 grades increased from no grade to V-0 and V-1 grades, flexural strength increased from 81 MPa to 122 MPa and 143 MPa, flexural elongation at break increased from 1.2% to 1.4% and 1.7%, and tensile properties were also obtained A certain improvement. The results show that the use of MWCNT-APP and PEI-APP intumescent flame retardant multilayer films can improve the flame retardant properties of the laminate, while improving the mechanical properties.