本文主要研究内容
作者朱慧鑫（2019）在《低反射特征聚合物基电磁屏蔽复合材料的制备与性能研究》一文中研究指出：人为电磁干扰源(如:通信、导航、家用电器以及工业器械等)产生电磁波,进而对精密电子设备产生电磁干扰(Electromagnetic Interference,EMI),电磁辐射还会对人体健康造成一定危害。导电聚合物基电磁屏蔽材料是由导电填料与聚合物填充复合而成,具有成本低、密度小、耐腐蚀、易成型和电磁屏蔽性能可控等优点,是一种可以替代传统金属基电磁屏蔽材料的新型材料。通过大量研究发现,具有优异导电性能的导电聚合物基电磁屏蔽材料可以有效阻止电磁波的传播,但高导电性能的电磁屏蔽材料主要是通过提高反射效能进而提高总电磁屏蔽效能的,这就造成了电磁波的二次污染。因此,低反射特征电磁屏蔽复合材料的研究变的尤为重要。本文通过对导电聚合物复合材料的结构设计,在保证高效电磁屏蔽性能的前提下,制备出具有低反射特征的电磁屏蔽材料。主要研究结果如下:(1)通过超声共沉淀及热压成型方法制备了具有良好电磁干扰(EMI)屏蔽性能的铁钴磁性纳米粒子装饰的还原氧化石墨烯(FeCo@rGO)/超高分子量聚乙烯(UHMWPE)纳米复合材料。首先,具有可调节的磁性和导电性能的rGO@FeCo沉积在UHMWPE颗粒的表面上。然后,将复合粒子通过热压在UHMWPE基质中形成隔离的3D FeCo@rGO导电网络。这种选择分布在UHMWPE中的3D FeCo@rGO磁性导电网络可以为复合材料提供良好的具有可调节的电性能和磁性能。由于FeCo@rGO导电网络中微波的多次反射和FeCo磁性纳米粒子引起的磁损耗,在FeCo@rGO的体积分数为8.97%时,FeCo@rGO/UHMWPE复合材料在X波段的电磁屏蔽效能可达21.8 dB,同时平均反射效能(SE_R)低至2.84 dB,反射率(R)仅为0.48。(2)通过铁钴合金装饰还原氧化石墨烯(FeCo@rGO)/纳米银(Ag)层状结构的构建,设计了一种低反射特征高电磁屏蔽(EMI)性能的水性聚氨酯(WPU)复合薄膜。FeCo@rGO通过自然沉降在WPU薄膜底部形成致密的微波吸收层,薄膜顶部通过等离子还原方法沉积Ag形成高屏蔽层。这种独特的层状结构结合了纳米Ag的高微波反射特性和FeCo@rGO的微波吸收特性,实现了低反射特征及高屏蔽性能。当FeCo@rGO质量分数为10 wt%,银层厚度为500 nm时,厚度仅为300μm的Ag/FeCo@rGO/WPU复合薄膜,在X波段的电磁屏蔽性能可达50.5 dB,同时微波反射系数低至0.49,对应微波反射效率为3.2 dB。(3)通过取向冷冻干燥制备以石墨烯负载铁钴(rGO@FeCo)及银包覆膨胀微球(EBAg)功能粒子掺杂的水性聚氨酯(WPU)取向复合泡沫,利用冰晶模板取向生长过程中功能纳米填料密度差异诱导WPU取向泡孔结构中FeCo@rGO磁性吸收层和EBAg导电屏蔽层有序梯度网络的形成,实现超高效电磁屏蔽复合泡沫的极低电磁波反射特征。得益于取向泡沫结构中梯度屏蔽网络所产生的“吸收-反射-再吸收”的特殊电磁衰减特性,使复合材料在获得超高效屏蔽效能的同时显示出极低的电磁反射特征:在极低导电粒子含量下(0.15 vol%Ag+0.33 vol%FeCo@rGO)X波段平均电磁屏蔽效能高达84.8 dB,同时平均反射效能(SE_R)低至0.3 dB,反射率(R)仅为0.08.
Abstract
ren wei dian ci gan rao yuan (ru :tong xin 、dao hang 、jia yong dian qi yi ji gong ye qi xie deng )chan sheng dian ci bo ,jin er dui jing mi dian zi she bei chan sheng dian ci gan rao (Electromagnetic Interference,EMI),dian ci fu she hai hui dui ren ti jian kang zao cheng yi ding wei hai 。dao dian ju ge wu ji dian ci bing bi cai liao shi you dao dian tian liao yu ju ge wu tian chong fu ge er cheng ,ju you cheng ben di 、mi du xiao 、nai fu shi 、yi cheng xing he dian ci bing bi xing neng ke kong deng you dian ,shi yi chong ke yi ti dai chuan tong jin shu ji dian ci bing bi cai liao de xin xing cai liao 。tong guo da liang yan jiu fa xian ,ju you you yi dao dian xing neng de dao dian ju ge wu ji dian ci bing bi cai liao ke yi you xiao zu zhi dian ci bo de chuan bo ,dan gao dao dian xing neng de dian ci bing bi cai liao zhu yao shi tong guo di gao fan she xiao neng jin er di gao zong dian ci bing bi xiao neng de ,zhe jiu zao cheng le dian ci bo de er ci wu ran 。yin ci ,di fan she te zheng dian ci bing bi fu ge cai liao de yan jiu bian de you wei chong yao 。ben wen tong guo dui dao dian ju ge wu fu ge cai liao de jie gou she ji ,zai bao zheng gao xiao dian ci bing bi xing neng de qian di xia ,zhi bei chu ju you di fan she te zheng de dian ci bing bi cai liao 。zhu yao yan jiu jie guo ru xia :(1)tong guo chao sheng gong chen dian ji re ya cheng xing fang fa zhi bei le ju you liang hao dian ci gan rao (EMI)bing bi xing neng de tie gu ci xing na mi li zi zhuang shi de hai yuan yang hua dan mo xi (FeCo@rGO)/chao gao fen zi liang ju yi xi (UHMWPE)na mi fu ge cai liao 。shou xian ,ju you ke diao jie de ci xing he dao dian xing neng de rGO@FeCochen ji zai UHMWPEke li de biao mian shang 。ran hou ,jiang fu ge li zi tong guo re ya zai UHMWPEji zhi zhong xing cheng ge li de 3D FeCo@rGOdao dian wang lao 。zhe chong shua ze fen bu zai UHMWPEzhong de 3D FeCo@rGOci xing dao dian wang lao ke yi wei fu ge cai liao di gong liang hao de ju you ke diao jie de dian xing neng he ci xing neng 。you yu FeCo@rGOdao dian wang lao zhong wei bo de duo ci fan she he FeCoci xing na mi li zi yin qi de ci sun hao ,zai FeCo@rGOde ti ji fen shu wei 8.97%shi ,FeCo@rGO/UHMWPEfu ge cai liao zai Xbo duan de dian ci bing bi xiao neng ke da 21.8 dB,tong shi ping jun fan she xiao neng (SE_R)di zhi 2.84 dB,fan she lv (R)jin wei 0.48。(2)tong guo tie gu ge jin zhuang shi hai yuan yang hua dan mo xi (FeCo@rGO)/na mi yin (Ag)ceng zhuang jie gou de gou jian ,she ji le yi chong di fan she te zheng gao dian ci bing bi (EMI)xing neng de shui xing ju an zhi (WPU)fu ge bao mo 。FeCo@rGOtong guo zi ran chen jiang zai WPUbao mo de bu xing cheng zhi mi de wei bo xi shou ceng ,bao mo ding bu tong guo deng li zi hai yuan fang fa chen ji Agxing cheng gao bing bi ceng 。zhe chong du te de ceng zhuang jie gou jie ge le na mi Agde gao wei bo fan she te xing he FeCo@rGOde wei bo xi shou te xing ,shi xian le di fan she te zheng ji gao bing bi xing neng 。dang FeCo@rGOzhi liang fen shu wei 10 wt%,yin ceng hou du wei 500 nmshi ,hou du jin wei 300μmde Ag/FeCo@rGO/WPUfu ge bao mo ,zai Xbo duan de dian ci bing bi xing neng ke da 50.5 dB,tong shi wei bo fan she ji shu di zhi 0.49,dui ying wei bo fan she xiao lv wei 3.2 dB。(3)tong guo qu xiang leng dong gan zao zhi bei yi dan mo xi fu zai tie gu (rGO@FeCo)ji yin bao fu peng zhang wei qiu (EBAg)gong neng li zi can za de shui xing ju an zhi (WPU)qu xiang fu ge pao mo ,li yong bing jing mo ban qu xiang sheng chang guo cheng zhong gong neng na mi tian liao mi du cha yi you dao WPUqu xiang pao kong jie gou zhong FeCo@rGOci xing xi shou ceng he EBAgdao dian bing bi ceng you xu ti du wang lao de xing cheng ,shi xian chao gao xiao dian ci bing bi fu ge pao mo de ji di dian ci bo fan she te zheng 。de yi yu qu xiang pao mo jie gou zhong ti du bing bi wang lao suo chan sheng de “xi shou -fan she -zai xi shou ”de te shu dian ci cui jian te xing ,shi fu ge cai liao zai huo de chao gao xiao bing bi xiao neng de tong shi xian shi chu ji di de dian ci fan she te zheng :zai ji di dao dian li zi han liang xia (0.15 vol%Ag+0.33 vol%FeCo@rGO)Xbo duan ping jun dian ci bing bi xiao neng gao da 84.8 dB,tong shi ping jun fan she xiao neng (SE_R)di zhi 0.3 dB,fan she lv (R)jin wei 0.08.
论文参考文献
论文详细介绍
论文作者分别是来自中北大学的朱慧鑫，发表于刊物中北大学2019-07-04论文，是一篇关于导电聚合物复合材料论文,铁钴负载石墨烯论文,电磁屏蔽论文,低反射特征论文,中北大学2019-07-04论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自中北大学2019-07-04论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：导电聚合物复合材料论文; 铁钴负载石墨烯论文; 电磁屏蔽论文; 低反射特征论文; 中北大学2019-07-04论文;