共轭聚席夫碱及其盐的合成及性能研究

发布时间：2018-04-27 05:43

本文选题：聚席夫碱 + 掺杂　；参考：《南京航空航天大学》2017年硕士论文

【摘要】：席夫碱是一类具有亚胺或甲亚胺基(-RC=N-)的有机化合物。根据理论分析及对前期研究进行总结,发现席夫碱类材料具有红外-雷达兼容隐身的潜力。本文首先通过二胺与二羰基化合物,缩合反应制备出6种不同结构的聚席夫碱,并在此基础上与FeCl3反应制备相应的铁盐。选取综合性能最好的对苯二甲醛缩2,6-二氨基吡啶聚席夫碱与炭黑复合,制备5种复合材料。通过结构表征及性能测试,揭示了席夫碱类材料结构、电导率、红外发射率、电磁参数之间的关系,证明通过调节席夫碱类材料的电导率可以达到红外-雷达兼容隐身的目的。主要包括以下几部分内容:(1)将乙二醛、对苯二甲醛、2,3-丁二酮分别与对苯二胺、2,6-二氨基吡啶反应,合成6种聚席夫碱,并将聚席夫碱与FeCl3进行掺杂,制得相应的铁盐。通过熔点、元素分析、NMR、FTIR、凝胶色谱、离子含量测试对聚合物进行结构表征,证明合成物具有席夫碱结构。通过对聚合物的电导率、红外发射率、电磁参数测试,研究三者之间的关系。(2)测试结果表明,共轭聚席夫碱在掺杂处理之前,电导率均保持在10-8 S·cm-1,掺杂处理后电导率增加至10-4~10-7 S·cm-1,可以提高1~4个数量级;其中二酮类聚席夫碱铁盐(C6)有着最佳电导率10-4 S·cm-1,最低红外发射率0.733;当f=9.64 GHz时,其介电损耗角正切tgδ1值达到最大0.29,当f=6.72 GHz时,其磁耗角正切tgδ2值达到最大0.24。(3)进一步的,选择综合性能最好的对苯二甲醛缩2,6-二氨基吡啶聚席夫碱,与炭黑进行复合,制备复合导电材料,并分别测量了其电导率,红外发射率和电磁参数。测试结果表明,添加炭黑可以提高复合材料的导电性,还可以降低材料的红外发射率,优化材料的吸波性能。当炭黑掺杂量为50%时,复合材料有着最佳电导率10-1S·cm-1,红外发射率为0.699,在9.8~15.4GHz波段有8dB以上的吸波损耗,在12GHz达到-19.4 dB。
[Abstract]:Schiff base is a class of organic compounds with imine or methylene iminimide. Based on theoretical analysis and previous studies, it is found that Schiff base materials have the potential of infrared radar compatible stealth. In this paper, six kinds of polySchiff bases with different structures were prepared by condensation of diamine and dicarbonyl compounds, and the corresponding iron salts were prepared by reaction with FeCl3. Five kinds of composite materials were prepared by using p-phenylaldehydes 2 ~ (6) -diaminopyridine polySchiff base and carbon black, which had the best comprehensive properties. The relationships among the structure, conductivity, infrared emissivity and electromagnetic parameters of Schiff base materials are revealed by structural characterization and performance tests. It is proved that the purpose of infrared radar compatible stealth can be achieved by adjusting the conductivity of Schiff base materials. The main contents are as follows: (1) six kinds of polySchiff bases were synthesized by the reaction of Glyoxal, p-benzaldehyde-2O3-butanedione with p-phenylenediamine (p-phenylenediamine) -6-diaminopyridine, and the corresponding iron salts were prepared by doping polySchiff base with FeCl3. The structure of the polymer was characterized by melting point, elemental analysis, NMR-FTIR, gel chromatography and ion content test, and the Schiff base structure was proved. By measuring the conductivity, infrared emissivity and electromagnetic parameters of the polymer, and studying the relationship between them, the results show that the conjugated polySchiff base is prior to doping treatment. The conductivity kept at 10-8 S cm-1, and the conductivity increased to 10-4 ~ 10-7 Scm-1 after doping, which could be increased by 1 ~ 4 orders of magnitude, in which diketone polySchiff base iron salt C6) had the best conductivity 10-4 S cm-1, the lowest infrared emissivity was 0.733, and the lowest infrared emissivity was 0.733 when FG was 9.64 GHz. The dielectric loss angle tangent TG 未 1 value reached the maximum 0.29, and the magnetic consumption angle tangent TG 未 2 value reached the maximum 0.24% when F = 6.72 GHz.) further, the best comprehensive properties of p-benzaldehyde 2-2-diaminopyridine polySchiff base were selected to compound with carbon black. The conductivity, infrared emissivity and electromagnetic parameters of composite conductive materials were measured. The results show that the addition of carbon black can improve the electrical conductivity of the composite, reduce the infrared emissivity of the composite, and optimize the absorbing property of the composite. When the amount of carbon black doping is 50, the composite has the best conductivity of 10-1S cm-1, infrared emissivity of 0.699. the absorption loss of the composite is more than 8dB in 9.8~15.4GHz band, and reaches to -19.4 dB at 12GHz.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O641.4

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