發(fā)布時間：2018-05-29 17:32

  本文選題：功能化 + 石墨烯　； 參考：《杭州師范大學》2015年碩士論文

【摘要】：石墨烯具有優(yōu)異的力學、熱學、電學性能,其已經(jīng)成為全世界新材料研究的熱點之一。但是,由于其巨大的比表面積和范德華力的作用,使得石墨烯極易團聚、石墨化,這影響到其在復合材料中的分散性,難以充分發(fā)揮出其本身固有的優(yōu)異性能。因此,如何有效的將石墨烯均勻分散到復合材料中是其應用的關鍵和難點所在。本論文通過研究功能化石墨烯及其與聚硅氧烷復合材料的制備方法和性能,從理論上找出提高石墨烯與聚硅氧烷熱力學相容性的方法,發(fā)掘提高該類復合材料力、熱、電性能的途徑,從而解決目前石墨烯復合材料制備和應用中的問題,進而獲得具有優(yōu)異物理化學特性的石墨烯/聚硅氧烷復合材料,主要研究內(nèi)容及結果如下:1.通過改良的Hummers法自制了氧化石墨烯,并采用化學還原法及高溫熱還原法分別進行還原得到石墨烯,以此為填料,研究了不同制備方法的石墨烯對復合材料導熱性能的影響。結果顯示:其對復合材料的導熱性能的影響不大,可見,提高復合材料的性能,需首先改善石墨烯和聚硅氧烷之間熱力學相容性。2.為了改善石墨烯與聚硅氧烷的熱力學相容性,我們采用硅烷偶聯(lián)劑十二烷基三甲氧基硅烷對石墨烯進行共價鍵功能化表面改性,并通過泡沫鎳構筑了3D的改性石墨烯網(wǎng)狀結構。結果顯示:石墨烯經(jīng)改性后能均勻的分散在有機溶劑中,其與聚硅氧烷的熱力學相容性得到改善,二者之間的分散性得到有效提高。3.相比共價鍵功能化的表面改性,我們還對石墨烯進行了非共價鍵功能化,制備了石墨烯/二氧化硅復合物,并對其電學性能以及與聚硅氧烷復合材料的力學、熱穩(wěn)定性能進行了研究。結果顯示:復合物的比容量可通過對二氧化硅的含量的控制進行有效的調節(jié),并且以此為填料的復合材料在力學與熱學性能上都有明顯的提升。
[Abstract]:Graphene has excellent mechanical, thermal and electrical properties, and it has become one of the hot spots in the research of new materials all over the world. However, because of its huge specific surface area and van der Waals force, graphene is easy to be agglomerated and graphitized, which affects its dispersibility in the composites and makes it difficult to give full play to its inherent excellent properties. Therefore, how to effectively disperse graphene into composites is the key and difficulty in its application. In this paper, the preparation methods and properties of functionalized graphene and its composites with polysiloxane were studied, and the methods to improve the thermodynamic compatibility of graphene and polysiloxane were found out theoretically, so as to improve the strength and heat of the composites. In order to solve the problems in the preparation and application of graphene composites, the graphene / polysiloxane composites with excellent physical and chemical properties are obtained. The main research contents and results are as follows: 1. Graphene oxide was prepared by modified Hummers method and was reduced to graphene by chemical reduction method and high temperature thermal reduction method respectively. The effect of different preparation methods on thermal conductivity of composites was studied. The results show that the thermal conductivity of the composites is not much affected. Therefore, it is necessary to improve the thermodynamic compatibility between graphene and polysiloxane by improving the properties of the composites. In order to improve the thermodynamic compatibility of graphene and polysiloxane, we used silane coupling agent dodecyl trimethoxy silane to modify graphene by covalently functionalized surface modification. The results show that graphene can be uniformly dispersed in organic solvent after modification, the thermodynamic compatibility of graphene with polysiloxane is improved, and the dispersion of graphene with polysiloxane is improved effectively. Compared with the surface modification of covalent bonding, graphene was also functionalized by non-covalent bonding. Graphene / silica composites were prepared, and their electrical properties and mechanical properties with polysiloxane composites were investigated. The thermal stability was studied. The results show that the specific capacity of the composites can be adjusted effectively by controlling the content of silica, and the mechanical and thermal properties of the composites are improved obviously.
【學位授予單位】：杭州師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ127.11;TB332

【參考文獻】

相關期刊論文 前1條

1 朱熠;滕騰;周宇飛;;硅橡膠在汽車上的應用研究[J];汽車工藝與材料;2013年11期

，

本文編號：1951789