本文主要研究内容
作者李星宇(2019)在《基于石墨烯的高性能电磁屏蔽膜的研究》一文中研究指出:随着通讯技术的发展,电子设备在商用、民用和军用领域均被广泛使用,其涉及的电磁干扰(EMI)屏蔽功能已经成为保护电子元件和人类免受电磁干扰不可或缺的部分。如何设计出高效轻质的电磁屏蔽器件已成为制约通讯技术行业中电磁屏蔽技术发展的关键问题。最先被应用到电磁屏蔽领域的金属及金属氧化物材料因其密度大、耐化学腐蚀性差和难加工的缺点已难以满足人们对电磁屏蔽材料轻质高效的要求,而碳纤维、碳纳米管和石墨烯等碳材料因密度小、导电性高、易加工等特点,逐渐成为了制备电磁干扰屏蔽材料的理想选择。众多碳材料中石墨烯作为一种比表面积大、强度高、导热和导电能力极为优异的二维纳米材料,近十年内被广泛的研究。然而,基于石墨烯的高性能电磁屏蔽膜的研究还远未完善,基于此,本课题针对这一方向开展了高性能电磁抗干扰屏蔽膜的设计制备及其功能和性能的研究,并深入讨论了相关机理,本论文的主要研究成果如下:(1)使用明胶(gelatin)作为交联剂与石墨烯(rLGO)通过真空抽滤的方式构建了一种二元复合膜。通过X射线能谱(EDS)、傅里叶红外光谱(FTIR)、X射线光电子能谱(XPS)表征薄膜的化学结构;通过扫面电子显微镜(SEM)和X射线衍射仪(XRD)表征了薄膜的物理结构,并对薄膜进行了力学性能、导电性能和电磁屏蔽性能的测试。研究结果表明,明胶分子可通过化学键和氢键的作用与石墨烯片层连接,形成空间立体网状交联结构,且这一交联结构并不会因为碘化氢还原而消失。明胶的引入会显著提升薄膜的机械性能,当明胶含量为10 wt%时,二元复合膜(rLG/G10)的拉伸强度、弹性模量和韧性可分别达到236±12.3 MPa、6.0±0.47 GPa和6.28±0.70 MJ/m3,是纯石墨烯薄膜的2.2倍、1.8倍和2.2倍,与此同时,rLG/G10的导电性能和电磁屏蔽性能也维持在一个较高的水平,分别为8888±838 S/m和32.2 dB。力学性能分析表明:通过化学键和氢键连接石墨烯的明胶,会极大地增加薄膜内部的结合力,导致强度的提高;而明胶作为一种具有良好柔性的一维高分子,在提升强度的同时也赋予薄膜良好的柔韧性。电磁屏蔽性能分析说明:通过此方法构建的复合膜拥有良好的导电网络,因此电磁屏蔽性能性始终维持在较高的水平。(2)使用明胶、钠基蒙脱土(MMT)和石墨烯通过真空抽滤的方式构建一种三元复合膜。通过EDS、FTIR和XPS表征了薄膜的化学结构;使用SEM和XRD表征薄膜的截面形貌和层状结构;对薄膜进行了力学性能,导电性能和电磁屏蔽性能的测试。明胶和蒙脱土可协同增强石墨烯膜的力学性能,当rLGO:Gelatin:MMT质量比为9:1:1时,三元复合膜(rLG/G10/M10)的拉伸强度可达260±20.1 MPa,该强度是纯石墨烯薄膜的2.4倍。相较于rLG/G10,rLG/G10/M10拉伸强度的提高主要归因于rLG/G10/M10内部具有比rLG/G10更强的结合力。与此同时,rLG/G10/M10的电磁屏蔽性能维持在一个较高的水平,达到30.5 dB,这主要是因为所构建的特殊层状结构使石墨烯在插层蒙脱土后仍可构建良好的导电网络。因着rLGO、gelatin和MMT间的相互作用,石墨烯膜的热稳定性会在加入gelatin和MMT后显著提高。更加值得注意的是,蒙脱土的引入提高了石墨烯薄膜的隔热性能,其原因在于MMT片层在三元网络中形成了均匀有序排列的砖块结构和自身导热率极低。(3)使用共沉淀法在氧化石墨(GO)烯表面修饰了四氧化三铁(Fe3O4)纳米粒子,并将修饰后的氧化石墨烯与天然橡胶(NR)胶乳进行复合,最终通过平板硫化制得rGO@Fe3O4/NR复合膜。通过FTIR、XPS和XRD表征rGO@Fe3O4的化学结构,通过SEM分析了复合材料的断面形貌,并对复合材料的力学性能、磁性能、导电性能和电磁屏蔽性能进行了测试。研究结果表明,rGO@Fe3O4制备成功。rGO@Fe3O4/NR复合膜的导电性能和饱和磁化强度随着rGO@Fe3O4添加量的增加而提高。rGO@Fe3O4的加入极大地提升了复合膜的拉伸强度和杨氏模量,在添加3份时分别达到18.3±0.76MPa和3.8±0.15 MPa,是纯天然橡胶的42.6倍和8.8倍。同时,在rGO@Fe3O4添加量达到8份时,复合膜的电磁屏蔽性能达到8.3 dB。
Abstract
sui zhao tong xun ji shu de fa zhan ,dian zi she bei zai shang yong 、min yong he jun yong ling yu jun bei an fan shi yong ,ji she ji de dian ci gan rao (EMI)bing bi gong neng yi jing cheng wei bao hu dian zi yuan jian he ren lei mian shou dian ci gan rao bu ke huo que de bu fen 。ru he she ji chu gao xiao qing zhi de dian ci bing bi qi jian yi cheng wei zhi yao tong xun ji shu hang ye zhong dian ci bing bi ji shu fa zhan de guan jian wen ti 。zui xian bei ying yong dao dian ci bing bi ling yu de jin shu ji jin shu yang hua wu cai liao yin ji mi du da 、nai hua xue fu shi xing cha he nan jia gong de que dian yi nan yi man zu ren men dui dian ci bing bi cai liao qing zhi gao xiao de yao qiu ,er tan qian wei 、tan na mi guan he dan mo xi deng tan cai liao yin mi du xiao 、dao dian xing gao 、yi jia gong deng te dian ,zhu jian cheng wei le zhi bei dian ci gan rao bing bi cai liao de li xiang shua ze 。zhong duo tan cai liao zhong dan mo xi zuo wei yi chong bi biao mian ji da 、jiang du gao 、dao re he dao dian neng li ji wei you yi de er wei na mi cai liao ,jin shi nian nei bei an fan de yan jiu 。ran er ,ji yu dan mo xi de gao xing neng dian ci bing bi mo de yan jiu hai yuan wei wan shan ,ji yu ci ,ben ke ti zhen dui zhe yi fang xiang kai zhan le gao xing neng dian ci kang gan rao bing bi mo de she ji zhi bei ji ji gong neng he xing neng de yan jiu ,bing shen ru tao lun le xiang guan ji li ,ben lun wen de zhu yao yan jiu cheng guo ru xia :(1)shi yong ming jiao (gelatin)zuo wei jiao lian ji yu dan mo xi (rLGO)tong guo zhen kong chou lv de fang shi gou jian le yi chong er yuan fu ge mo 。tong guo Xshe xian neng pu (EDS)、fu li xie gong wai guang pu (FTIR)、Xshe xian guang dian zi neng pu (XPS)biao zheng bao mo de hua xue jie gou ;tong guo sao mian dian zi xian wei jing (SEM)he Xshe xian yan she yi (XRD)biao zheng le bao mo de wu li jie gou ,bing dui bao mo jin hang le li xue xing neng 、dao dian xing neng he dian ci bing bi xing neng de ce shi 。yan jiu jie guo biao ming ,ming jiao fen zi ke tong guo hua xue jian he qing jian de zuo yong yu dan mo xi pian ceng lian jie ,xing cheng kong jian li ti wang zhuang jiao lian jie gou ,ju zhe yi jiao lian jie gou bing bu hui yin wei dian hua qing hai yuan er xiao shi 。ming jiao de yin ru hui xian zhe di sheng bao mo de ji xie xing neng ,dang ming jiao han liang wei 10 wt%shi ,er yuan fu ge mo (rLG/G10)de la shen jiang du 、dan xing mo liang he ren xing ke fen bie da dao 236±12.3 MPa、6.0±0.47 GPahe 6.28±0.70 MJ/m3,shi chun dan mo xi bao mo de 2.2bei 、1.8bei he 2.2bei ,yu ci tong shi ,rLG/G10de dao dian xing neng he dian ci bing bi xing neng ye wei chi zai yi ge jiao gao de shui ping ,fen bie wei 8888±838 S/mhe 32.2 dB。li xue xing neng fen xi biao ming :tong guo hua xue jian he qing jian lian jie dan mo xi de ming jiao ,hui ji da de zeng jia bao mo nei bu de jie ge li ,dao zhi jiang du de di gao ;er ming jiao zuo wei yi chong ju you liang hao rou xing de yi wei gao fen zi ,zai di sheng jiang du de tong shi ye fu yu bao mo liang hao de rou ren xing 。dian ci bing bi xing neng fen xi shui ming :tong guo ci fang fa gou jian de fu ge mo yong you liang hao de dao dian wang lao ,yin ci dian ci bing bi xing neng xing shi zhong wei chi zai jiao gao de shui ping 。(2)shi yong ming jiao 、na ji meng tuo tu (MMT)he dan mo xi tong guo zhen kong chou lv de fang shi gou jian yi chong san yuan fu ge mo 。tong guo EDS、FTIRhe XPSbiao zheng le bao mo de hua xue jie gou ;shi yong SEMhe XRDbiao zheng bao mo de jie mian xing mao he ceng zhuang jie gou ;dui bao mo jin hang le li xue xing neng ,dao dian xing neng he dian ci bing bi xing neng de ce shi 。ming jiao he meng tuo tu ke xie tong zeng jiang dan mo xi mo de li xue xing neng ,dang rLGO:Gelatin:MMTzhi liang bi wei 9:1:1shi ,san yuan fu ge mo (rLG/G10/M10)de la shen jiang du ke da 260±20.1 MPa,gai jiang du shi chun dan mo xi bao mo de 2.4bei 。xiang jiao yu rLG/G10,rLG/G10/M10la shen jiang du de di gao zhu yao gui yin yu rLG/G10/M10nei bu ju you bi rLG/G10geng jiang de jie ge li 。yu ci tong shi ,rLG/G10/M10de dian ci bing bi xing neng wei chi zai yi ge jiao gao de shui ping ,da dao 30.5 dB,zhe zhu yao shi yin wei suo gou jian de te shu ceng zhuang jie gou shi dan mo xi zai cha ceng meng tuo tu hou reng ke gou jian liang hao de dao dian wang lao 。yin zhao rLGO、gelatinhe MMTjian de xiang hu zuo yong ,dan mo xi mo de re wen ding xing hui zai jia ru gelatinhe MMThou xian zhe di gao 。geng jia zhi de zhu yi de shi ,meng tuo tu de yin ru di gao le dan mo xi bao mo de ge re xing neng ,ji yuan yin zai yu MMTpian ceng zai san yuan wang lao zhong xing cheng le jun yun you xu pai lie de zhuan kuai jie gou he zi shen dao re lv ji di 。(3)shi yong gong chen dian fa zai yang hua dan mo (GO)xi biao mian xiu shi le si yang hua san tie (Fe3O4)na mi li zi ,bing jiang xiu shi hou de yang hua dan mo xi yu tian ran xiang jiao (NR)jiao ru jin hang fu ge ,zui zhong tong guo ping ban liu hua zhi de rGO@Fe3O4/NRfu ge mo 。tong guo FTIR、XPShe XRDbiao zheng rGO@Fe3O4de hua xue jie gou ,tong guo SEMfen xi le fu ge cai liao de duan mian xing mao ,bing dui fu ge cai liao de li xue xing neng 、ci xing neng 、dao dian xing neng he dian ci bing bi xing neng jin hang le ce shi 。yan jiu jie guo biao ming ,rGO@Fe3O4zhi bei cheng gong 。rGO@Fe3O4/NRfu ge mo de dao dian xing neng he bao he ci hua jiang du sui zhao rGO@Fe3O4tian jia liang de zeng jia er di gao 。rGO@Fe3O4de jia ru ji da de di sheng le fu ge mo de la shen jiang du he yang shi mo liang ,zai tian jia 3fen shi fen bie da dao 18.3±0.76MPahe 3.8±0.15 MPa,shi chun tian ran xiang jiao de 42.6bei he 8.8bei 。tong shi ,zai rGO@Fe3O4tian jia liang da dao 8fen shi ,fu ge mo de dian ci bing bi xing neng da dao 8.3 dB。
论文参考文献
论文详细介绍
论文作者分别是来自太原理工大学的李星宇,发表于刊物太原理工大学2019-07-26论文,是一篇关于石墨烯论文,复合材料论文,力学性能论文,电磁屏蔽性能论文,太原理工大学2019-07-26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,资料来自太原理工大学2019-07-26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:石墨烯论文; 复合材料论文; 力学性能论文; 电磁屏蔽性能论文; 太原理工大学2019-07-26论文;