吸波—相变微胶囊红外微波兼容隐身复合材料的研究
发布时间：2019-02-27 16:35
【摘要】：本文采用种子微悬浮聚合法,以苯乙烯-二乙烯基苯为复合壁材,分别以月桂酸和硬脂酸丁酯作为中温区和低温区相变芯材,制备了LMPCM和BMPCM两类相变微胶囊(MCPCM);将纳米Fe3O4粒子、RGO两种雷达吸波材料(RAM)在相变微胶囊壁面原位组装,制备了Fe3O4-LMPCM、RGO-LMPCM、Fe3O4-BMPCM和RGO-BMPCM四种吸波-相变微胶囊材料(RAM-MCPCM);以RAM-MCPCM作为功能填料,制备了红外微波隐身涂料和RAM-LMPCM/PS红外微波隐身复合材料。利用FT-IR、SEM、粒度分析仪、DSC、TG、振动样品磁强计(VSM)等表征了RAM-MCPCM的化学组成、微观结构、热学性能和磁学性能。运用矢量网络分析仪,通过弓形反射法测试了涂层的电磁波吸收性能;使用自制一维平板热传递模型测试了涂层的红外隐身性能;按照国家标准测试了涂层的力学性能。表征了RAM-LMPCM/PS复合材料的热性能和断面形貌;测试了复合材料红外隐身性能、宏观力学性能和摩擦学性能。研究结果表明:LMPCM和BMPCM为规整球形、表面光滑,RAM-LMPCM和RAM-BMPCM为规整球形、表面呈微凸状。优化芯壁比为1.5:1时,LMPCM的相变潜热和包覆率分别为99.2 J/g和57.4%,w(Fe3O4)=8.0%的Fe3O4-LMPCM相变潜热为85 J/g,w(RGO)=2.0%的RGO-LMPCM相变潜热为90 J/g;优化芯壁比为1.4:1时,BMPCM的相变潜热和包覆率分别为66.5 J/g和55.4%,w(Fe3O4)=8.0%的Fe3O4-BMPCM相变潜热为63 J/g,w(RGO)=2.0%的RGOBMPCM相变潜热为65 J/g。涂层厚度为0.5 mm时,Fe3O4-LMPCM/环氧涂层在5.2 GHz时达到最大吸收峰值-0.54 d B,RGO-LMPCM/环氧涂层在8.8 GHz时达到最大反射损耗-1.21 d B,Fe3O4-BMPCM/环氧涂层在5.3 GHz时达到最大吸收峰值-0.50 d B,RGO-BMPCM/环氧涂层在8.8 GHz时达到最大反射损耗-1.13 d B;在相变温度范围内,添加RAM-MCPCM的环氧涂层和PS可有效屏蔽目标红外辐射,达到红外隐身的目的。在摩擦过程中,RGO-LMPCM对基体材料PS起到一定的润滑和减摩效果,w(RGO-LMPCM)=20%的RGO-LMPCM/PS复合材料平均摩擦系数为0.51。综合分析表明:采用种子微悬浮聚合法制备的吸波-相变微胶囊呈规整球形,在掺杂RAM的同时具有较高的相变潜热和包覆率;RAM-MCPCM作为功能填料的复合材料具有红外微波兼容隐身功能;适量的RAM-MCPCM对复合材料有一定的增强增韧作用。
[Abstract]:In this paper, LMPCM and BMPCM microcapsules (MCPCM); were prepared by seed suspension polymerization using styrene divinylbenzene as composite wall material and lauric acid and butyl stearate as phase change core materials in medium and low temperature regions respectively. Four kinds of absorbing-phase change microcapsules (RAM-MCPCM) of Fe3O4-LMPCM,RGO-LMPCM,Fe3O4-BMPCM and RGO-BMPCM were prepared by in-situ assembly of nano-Fe3O4 particles and RGO radar absorbing materials (RAM) on the wall of phase change microcapsules. Infrared microwave stealthy coatings and RAM-LMPCM/PS infrared stealthy composites were prepared by using RAM-MCPCM as functional filler. The chemical composition, microstructure, thermal and magnetic properties of RAM-MCPCM were characterized by FT-IR,SEM, particle size analyzer and DSC,TG, vibrating sample magnetometer (VSM). The electromagnetic wave absorption property of the coating was tested by using the vector network analyzer, the infrared stealthy property of the coating was tested by using the self-made one-dimensional plate heat transfer model, and the mechanical properties of the coating were tested according to the national standard. The thermal properties and cross-section morphology of RAM-LMPCM/PS composites were characterized, and the infrared stealthy properties, macroscopic mechanical properties and tribological properties of the composites were tested. The results show that LMPCM and BMPCM are regular sphere with smooth surface, RAM-LMPCM and RAM-BMPCM are regular spherical, and the surface is slightly convex. When the ratio of core to wall is 1.5: 1, the latent heat of phase transition and coating rate of LMPCM are 99.2 J / g and 57.4%, respectively, and the latent heat of phase transition of Fe3O4-LMPCM with w (Fe3O4) = 8.0% is 85 J / g, respectively. The latent heat of phase transition of RGO-LMPCM with w (RGO) = 2.0% is 90 J 路g ~ (- 1); When the ratio of core to wall is 1.4: 1, the latent heat of phase transition and coating rate of BMPCM are 66.5J / g and 55.4%, respectively, and the latent heat of phase transition of Fe3O4-BMPCM with w (Fe3O4) = 8.0% is 63J / g, respectively. The latent heat of phase transition of RGOBMPCM with w (RGO) = 2.0% is 65 J 路g 路L ~ (- 1). When the thickness of the coating is 0.5 mm, the maximum absorption peak of the Fe3O4-LMPCM/ epoxy coating is-0.54 dB at 5.2 GHz, and the maximum reflection loss of-1.21 dB is achieved at 8.8GHz for the RGOLMPCM / epoxy coating. The maximum absorption peak of Fe3O4-BMPCM/ epoxy coating was-0.50dB at 5.3GHz, and the maximum reflection loss of RGOBMPCM / epoxy coating was-1.13dB at 8.8GHz. In the temperature range of phase transition, epoxy coating with RAM-MCPCM and PS can effectively shield the infrared radiation of the target and achieve the purpose of infrared stealthy. In the process of friction, the average friction coefficient of RGO-LMPCM/PS composites with 20% RGO-LMPCM is 0.51. 1. The average friction coefficient of RGO-LMPCM/PS composites is 0. 51. The lubrication and antifriction effect of RGO-LMPCM/PS composites is 20%. The comprehensive analysis shows that the microwave absorbing-phase transition microcapsules prepared by seed microsuspension polymerization are regular spherical and have high phase change latent heat and coating rate while doping RAM. The composites with RAM-MCPCM as functional fillers have infrared and microwave compatible stealthy function, and a proper amount of RAM-MCPCM can strengthen and toughen the composites to a certain extent.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332
[Abstract]:In this paper, LMPCM and BMPCM microcapsules (MCPCM); were prepared by seed suspension polymerization using styrene divinylbenzene as composite wall material and lauric acid and butyl stearate as phase change core materials in medium and low temperature regions respectively. Four kinds of absorbing-phase change microcapsules (RAM-MCPCM) of Fe3O4-LMPCM,RGO-LMPCM,Fe3O4-BMPCM and RGO-BMPCM were prepared by in-situ assembly of nano-Fe3O4 particles and RGO radar absorbing materials (RAM) on the wall of phase change microcapsules. Infrared microwave stealthy coatings and RAM-LMPCM/PS infrared stealthy composites were prepared by using RAM-MCPCM as functional filler. The chemical composition, microstructure, thermal and magnetic properties of RAM-MCPCM were characterized by FT-IR,SEM, particle size analyzer and DSC,TG, vibrating sample magnetometer (VSM). The electromagnetic wave absorption property of the coating was tested by using the vector network analyzer, the infrared stealthy property of the coating was tested by using the self-made one-dimensional plate heat transfer model, and the mechanical properties of the coating were tested according to the national standard. The thermal properties and cross-section morphology of RAM-LMPCM/PS composites were characterized, and the infrared stealthy properties, macroscopic mechanical properties and tribological properties of the composites were tested. The results show that LMPCM and BMPCM are regular sphere with smooth surface, RAM-LMPCM and RAM-BMPCM are regular spherical, and the surface is slightly convex. When the ratio of core to wall is 1.5: 1, the latent heat of phase transition and coating rate of LMPCM are 99.2 J / g and 57.4%, respectively, and the latent heat of phase transition of Fe3O4-LMPCM with w (Fe3O4) = 8.0% is 85 J / g, respectively. The latent heat of phase transition of RGO-LMPCM with w (RGO) = 2.0% is 90 J 路g ~ (- 1); When the ratio of core to wall is 1.4: 1, the latent heat of phase transition and coating rate of BMPCM are 66.5J / g and 55.4%, respectively, and the latent heat of phase transition of Fe3O4-BMPCM with w (Fe3O4) = 8.0% is 63J / g, respectively. The latent heat of phase transition of RGOBMPCM with w (RGO) = 2.0% is 65 J 路g 路L ~ (- 1). When the thickness of the coating is 0.5 mm, the maximum absorption peak of the Fe3O4-LMPCM/ epoxy coating is-0.54 dB at 5.2 GHz, and the maximum reflection loss of-1.21 dB is achieved at 8.8GHz for the RGOLMPCM / epoxy coating. The maximum absorption peak of Fe3O4-BMPCM/ epoxy coating was-0.50dB at 5.3GHz, and the maximum reflection loss of RGOBMPCM / epoxy coating was-1.13dB at 8.8GHz. In the temperature range of phase transition, epoxy coating with RAM-MCPCM and PS can effectively shield the infrared radiation of the target and achieve the purpose of infrared stealthy. In the process of friction, the average friction coefficient of RGO-LMPCM/PS composites with 20% RGO-LMPCM is 0.51. 1. The average friction coefficient of RGO-LMPCM/PS composites is 0. 51. The lubrication and antifriction effect of RGO-LMPCM/PS composites is 20%. The comprehensive analysis shows that the microwave absorbing-phase transition microcapsules prepared by seed microsuspension polymerization are regular spherical and have high phase change latent heat and coating rate while doping RAM. The composites with RAM-MCPCM as functional fillers have infrared and microwave compatible stealthy function, and a proper amount of RAM-MCPCM can strengthen and toughen the composites to a certain extent.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332
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