【摘要】：本文采用種子微懸浮聚合法,以苯乙烯-二乙烯基苯為復合壁材,分別以月桂酸和硬脂酸丁酯作為中溫區(qū)和低溫區(qū)相變芯材,制備了LMPCM和BMPCM兩類相變微膠囊(MCPCM);將納米Fe3O4粒子、RGO兩種雷達吸波材料(RAM)在相變微膠囊壁面原位組裝,制備了Fe3O4-LMPCM、RGO-LMPCM、Fe3O4-BMPCM和RGO-BMPCM四種吸波-相變微膠囊材料(RAM-MCPCM);以RAM-MCPCM作為功能填料,制備了紅外微波隱身涂料和RAM-LMPCM/PS紅外微波隱身復合材料。利用FT-IR、SEM、粒度分析儀、DSC、TG、振動樣品磁強計(VSM)等表征了RAM-MCPCM的化學組成、微觀結(jié)構(gòu)、熱學性能和磁學性能。運用矢量網(wǎng)絡分析儀,通過弓形反射法測試了涂層的電磁波吸收性能;使用自制一維平板熱傳遞模型測試了涂層的紅外隱身性能;按照國家標準測試了涂層的力學性能。表征了RAM-LMPCM/PS復合材料的熱性能和斷面形貌;測試了復合材料紅外隱身性能、宏觀力學性能和摩擦學性能。研究結(jié)果表明:LMPCM和BMPCM為規(guī)整球形、表面光滑,RAM-LMPCM和RAM-BMPCM為規(guī)整球形、表面呈微凸狀。優(yōu)化芯壁比為1.5:1時,LMPCM的相變潛熱和包覆率分別為99.2 J/g和57.4%,w(Fe3O4)=8.0%的Fe3O4-LMPCM相變潛熱為85 J/g,w(RGO)=2.0%的RGO-LMPCM相變潛熱為90 J/g;優(yōu)化芯壁比為1.4:1時,BMPCM的相變潛熱和包覆率分別為66.5 J/g和55.4%,w(Fe3O4)=8.0%的Fe3O4-BMPCM相變潛熱為63 J/g,w(RGO)=2.0%的RGOBMPCM相變潛熱為65 J/g。涂層厚度為0.5 mm時,Fe3O4-LMPCM/環(huán)氧涂層在5.2 GHz時達到最大吸收峰值-0.54 d B,RGO-LMPCM/環(huán)氧涂層在8.8 GHz時達到最大反射損耗-1.21 d B,Fe3O4-BMPCM/環(huán)氧涂層在5.3 GHz時達到最大吸收峰值-0.50 d B,RGO-BMPCM/環(huán)氧涂層在8.8 GHz時達到最大反射損耗-1.13 d B;在相變溫度范圍內(nèi),添加RAM-MCPCM的環(huán)氧涂層和PS可有效屏蔽目標紅外輻射,達到紅外隱身的目的。在摩擦過程中,RGO-LMPCM對基體材料PS起到一定的潤滑和減摩效果,w(RGO-LMPCM)=20%的RGO-LMPCM/PS復合材料平均摩擦系數(shù)為0.51。綜合分析表明:采用種子微懸浮聚合法制備的吸波-相變微膠囊呈規(guī)整球形,在摻雜RAM的同時具有較高的相變潛熱和包覆率;RAM-MCPCM作為功能填料的復合材料具有紅外微波兼容隱身功能;適量的RAM-MCPCM對復合材料有一定的增強增韌作用。
[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.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB332

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