以聚丙烯酸阳离子交换树脂(PAA)为碳源,与铁、镍二价离子交换后形成含金属的前驱体(M/PAA),经500℃热解制备碳包裹纳米铁、镍及其合金粒子.采用TG研究了前驱体PAA和M/PAA的热解特性;采用XRD、HRTEM等对热解产物的形貌和结构进行了分析表征,并采用弓形法测试了热解产物对电磁波的吸收性能.结果表明,M/PAA的热稳定性强于PAA;500℃热解M/PAA可获得粒径为10～35nm的碳包裹纳米铁、镍及其合金粒子.以碳包裹纳米铁、镍和铁镍合金粒子为吸收剂(质量分数为50%),石蜡为粘结剂,涂层厚为2mm时,碳包裹纳米铁粒子的吸波性能最好,在11.7GHz频率时吸收峰值Rmin为-10dB,频宽△dB可达6.0GHz.
Carbon-encapsulated Fe, Ni, and FeNi alloy nano particles are prepared by pyrolysis of metal-exchanged cation exchange resin(M/PAA) at temperature of 500℃. TG results show that the thermal stability of M/PAA is better than that of pure PAA resin. X RD, HRTEM results show the particle size of Fe, Ni and FeNi alloy nano particles is in the range of 10～35nm. Electromagnetic absorbing property tests of carbon-encapsulated iron,nickel,FeNi alloy nano particles pyrolyzed at temperature of 500℃ indicate that carbon-encapsulated iron nano-particles has more strongly electromagnetic absorbing efficiency than the others. For 50% mass fraction in wax and 2mm-thickness of carbon-encapsulated iron nano- particles, at f= 11.7GHz, Rmin = - 10dB and △dB= 6. 0GHz.
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