【摘要】：隨著信息技術和電子技術的快速發(fā)展,人們生活中出現(xiàn)了大量的電器設備,各種電器設備在提高人們的工作效率和生活質(zhì)量的同時,也產(chǎn)生了大量的電磁輻射,給人們的生活帶來了不便,對人類的生命健康造成了威脅。因此,對高性能屏蔽材料研究就顯得非常重要了。石墨烯擁有獨特的結構,超強的導電性能,是很有發(fā)展前景的電磁屏蔽材料。同時鎳也是一種具有高磁導率物質(zhì),可以對電磁波產(chǎn)生很大的吸收損耗,是一種非常有發(fā)展?jié)摿Φ钠帘尾牧稀１狙芯恐饕蕴祭w維和植物纖維作為基本骨架原料,通過真空減壓抽濾法來制備石墨烯/碳纖維電磁屏蔽紙和化學鍍鎳植物纖維/碳纖維電磁屏蔽紙,并對導電性能和電磁屏蔽性能進行系統(tǒng)研究,為高性能的電磁屏蔽產(chǎn)品的制備提供一定的理論依據(jù)。首先,對碳纖維進行氧化改性處理,使其表面的活性基團數(shù)量增多。然后分別對化學鍍鎳后的植物纖維、碳纖維的混合體系的分散性和石墨烯、植物纖維、碳纖維混合體系的分散性進行了研究。發(fā)現(xiàn)混合體系的粘度,隨著還原劑二甲基氨硼烷(DMAB)用量的增大,先降低后升高,當還原劑二甲基氨硼烷(DMAB)用量為3g/L時,混合體系的粘度最低,分散性能最好,同時包覆率也較大。同時對石墨烯、植物纖維和碳纖維漿料混合體系分散性的因素進行探究,發(fā)現(xiàn)當疏解轉數(shù)為20000r/min,超聲時間為22.5min,加入的CPAM用量為0.5%時,石墨烯、植物纖維和碳纖維漿料的混合體系分散性最好。其次,采用真空抽濾將具有超強導電性的石墨烯材料加入到紙基材料內(nèi)部,制備出石墨烯/碳纖維紙基屏蔽材料,研究了石墨烯添加量對碳纖維紙基材料的導電性能和屏蔽性能的影響;采用探究得到的最佳實驗工藝制備石墨烯/碳纖維紙基材料,采用掃描電鏡、抗張強度測試儀、四探針電阻率測試儀和矢量網(wǎng)絡分析儀對石墨烯/碳纖維紙基材料進行表面形貌、力學性能、導電性能和電磁屏蔽性能的表征,研究石墨烯添加量對石墨烯紙基材料的影響,發(fā)現(xiàn)石墨烯添加量為10wt%時,石墨烯/碳纖維紙的電阻率降低到最小值0.662?·cm,同時,石墨烯/碳纖維紙具有最高的電磁屏蔽效能。此外,使用化學鍍的方法在植物纖維表面進行化學鍍鎳,然后采用真空抽濾制備植物纖維化學鍍鎳的碳纖維紙基材料,研究了鎳的包覆量對紙基材料的力學性能、導電性能和屏蔽性能的影響,并將化學鍍鎳碳纖維紙基材料和石墨烯/碳纖維紙基材料進行了對比分析研究。綜合對比兩種碳纖維紙基材料,得到結論:相比于石墨烯/碳纖維紙基材料,化學鍍鎳的碳纖維紙基材料在力學性能和導電性能方面相差都比較大,但其電磁屏蔽性能卻和石墨烯/碳纖維紙基材料無明顯差異,相同頻率下,相差不超過2dB。綜上所述,與化學鍍鎳碳纖維紙相比較,石墨烯/碳纖維紙更適合應用在電磁屏蔽方面,可以更好地對電磁波進行屏蔽。
[Abstract]:With the rapid development of information technology and electronic technology, a large number of electrical equipment have appeared in people's lives. All kinds of electrical equipment not only improve people's working efficiency and quality of life, but also produce a lot of electromagnetic radiation. It brings inconvenience to people's life and threatens the life and health of human beings. Therefore, it is very important to study high performance shielding materials. Graphene, with its unique structure and excellent electrical conductivity, is a promising electromagnetic shielding material. At the same time, nickel is also a kind of high permeability material, which can cause great absorption loss to electromagnetic wave, and it is a kind of shielding material with great development potential. In this study, carbon fiber and plant fiber were used as basic skeleton materials to prepare graphene / carbon fiber electromagnetic shielding paper and electroless nickel-coated vegetable fiber / carbon fiber electromagnetic shielding paper by vacuum filtration method. The electrical conductivity and electromagnetic shielding performance are systematically studied to provide a theoretical basis for the preparation of high performance electromagnetic shielding products. Firstly, the surface active groups of carbon fiber were increased by oxidation modification. Then the dispersity of plant fiber, carbon fiber mixed system and graphene, plant fiber and carbon fiber mixed system after electroless nickel plating were studied respectively. It was found that the viscosity of the mixed system decreased first and then increased with the increase of the (DMAB) content of dimethylamino borane. When the content of (DMAB) was 3g/L, the viscosity of the mixed system was the lowest and the dispersion property was the best. At the same time, the coating rate is also large. At the same time, the factors of dispersity of graphene, plant fiber and carbon fiber paste were investigated. It was found that when the hydrophobic number was 200r / min, the ultrasonic time was 22.5min and the amount of CPAM added was 0.5g / min, graphene was obtained. The mixture of plant fiber and carbon fiber paste has the best dispersion. Secondly, graphene / carbon fiber paper-base shielding material was prepared by adding graphene material with super conductivity into paper based material by vacuum filtration. The effects of graphene addition on the conductive and shielding properties of carbon fiber paper based materials were studied, and the graphene / carbon fiber paper based materials were prepared by the optimum experimental process, and the tensile strength tester and scanning electron microscope were used to prepare graphene / carbon fiber paper based materials. The surface morphology, mechanical properties, electrical conductivity and electromagnetic shielding properties of graphene / carbon fiber paper-based materials were characterized by four-probe resistivity tester and vector network analyzer. The effect of graphene addition on graphene paper-based materials was studied. It is found that the resistivity of graphene / carbon fiber paper decreases to a minimum of 0.662? cm, when the content of graphene is 10 wt%, and the graphene / carbon fiber paper has the highest electromagnetic shielding efficiency. In addition, electroless nickel plating was carried out on the surface of plant fibers by electroless plating, and carbon fiber paper based materials were prepared by vacuum filtration. The mechanical properties of paper based materials were studied by coating amount of nickel. The effects of electroless nickel coated carbon fiber paper based materials and graphene / carbon fiber paper based materials on the electrical conductivity and shielding properties were compared and studied. Compared with graphene / carbon fiber paper based materials, compared with graphene / carbon fiber paper based materials, electroless nickel coated carbon fiber paper based materials have great difference in mechanical properties and conductive properties. However, there is no obvious difference between the electromagnetic shielding properties and graphene / carbon fiber paper based materials, and the difference is not more than 2 dB at the same frequency. In conclusion, compared with electroless nickel coated carbon fiber paper, graphene / carbon fiber paper is more suitable for electromagnetic shielding and can shield electromagnetic wave better.
【學位授予單位】：陜西科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TS761.2

【參考文獻】

相關期刊論文 前10條

1 沈順玲;;電磁屏蔽材料研究進展[J];考試周刊;2016年64期

2 榮幸;劉哲;張永恒;;不銹鋼纖維混紡型雙層電磁屏蔽織物的屏蔽效能研究[J];絲綢;2015年05期

3 趙慧慧;姬科舉;許銀松;黃正跟;戴振東;;GNS/PMMA泡沫復合材料的制備及其電磁屏蔽性能[J];材料科學與工程學報;2014年03期

4 姜志旺;崔占豪;張紅霞;;電磁污染:看不見的危害[J];生態(tài)經(jīng)濟;2014年04期

5 于名訊;徐勤濤;龐旭堂;連軍濤;劉玉鳳;;電磁屏蔽材料的研究進展[J];宇航材料工藝;2012年04期

6 閆禎;丁鐵柱;潮洛蒙;尚濤;王曉波;張磊;;La-Cu系材料電磁屏蔽性能研究[J];稀土;2011年03期

7 何和智;劉sネ，

本文編號：2273441