本文選題：導熱復合材料 + 石墨烯　； 參考：《寧波大學》2017年碩士論文

【摘要】：導熱復合材料作為填充于熱源與散熱器之間用于熱傳輸?shù)牟牧?對電子元器件的正常運行和使用壽命有著重要影響,因此具有高熱導率的導熱復合材料的制備成為導熱領(lǐng)域的重要研究課題。石墨烯的熱導率高達5300 W/(m·K),是目前已知材料中熱導率最高的,同時其擁有質(zhì)輕、比表面積高、結(jié)構(gòu)穩(wěn)定、機械性能好等優(yōu)點成為目前最理想的導熱填料之一。然而,采用傳統(tǒng)共混方法難以實現(xiàn)石墨烯在高分子基體中的均勻分散,不利于構(gòu)建高效的導熱網(wǎng)絡。同時,共混方法也難以控制石墨烯導熱網(wǎng)絡的結(jié)構(gòu),無法發(fā)揮石墨烯各向異性的導熱特性。針對上述問題,本論文提出了通過自組裝預先構(gòu)筑基于石墨烯的三維導熱網(wǎng)絡,以制備具有高熱導率的導熱復合材料的研究思路。論文的主要研究工作如下:1、通過乙醇和水混合溶劑揮發(fā)誘導石墨烯自組裝,構(gòu)建石墨烯三維導熱網(wǎng)絡,進而通過樹脂灌注,獲得具有高熱導率的導熱復合材料。研究了在石墨烯三維組裝體的制備過程中石墨烯的濃度、混合溶劑中乙醇和水的體積比、揮發(fā)溫度等條件對三維組裝體結(jié)構(gòu)的影響,以及三維組裝體的微觀結(jié)構(gòu)、密度等對復合材料導熱性能的影響。結(jié)果表明,該方法不僅保證了石墨烯良好的分散,而且能夠在一定程度上實現(xiàn)石墨烯在高分子基體中的定向排列,從而可以獲得具有優(yōu)異導熱性能的石墨烯基導熱復合材料2、以氧化石墨烯和氮化硼為前驅(qū)體,通過水熱方式構(gòu)筑石墨烯與六方氮化硼復合三維導熱網(wǎng)絡。研究了制備過程中石墨烯與氮化硼的質(zhì)量比對導熱網(wǎng)絡結(jié)構(gòu)的影響,同時探索了石墨烯與氮化硼之間的協(xié)同效應,以及氧化石墨烯與氮化硼的質(zhì)量比對復合材料的導熱性能和絕緣性能的影響。結(jié)果表明,石墨烯與氮化硼的復合并用提升了體系的導熱性能,同時與單純使用石墨烯相比,賦予了導熱復合材料更好的絕緣性能。
[Abstract]:Thermal conductivity composite material, which is used for heat transfer between heat source and radiator, has an important effect on the normal operation and service life of electronic components. Therefore, the preparation of thermal conductive composites with high thermal conductivity has become an important research topic in the field of thermal conductivity. The thermal conductivity of graphene is as high as 5300 W / m Ke, which is the highest among known materials. At the same time, it has the advantages of light weight, high specific surface area, stable structure, good mechanical properties and so on. It has become one of the most ideal thermal conductivity fillers at present. However, it is difficult to realize the uniform dispersion of graphene in polymer matrix by traditional blending method, which is not conducive to the construction of efficient thermal conductivity network. At the same time, it is difficult to control the structure of graphene heat conduction network by blending method, and it is unable to display the anisotropic thermal conductivity of graphene. In order to solve the above problems, this paper proposes a new method to fabricate thermal conductivity composites with high thermal conductivity by constructing a three dimensional heat conduction network based on graphene by self assembly. The main work of this paper is as follows: 1. Through ethanol and water mixed solvent volatilization induced graphene self-assembly, the three-dimensional thermal conductivity network of graphene was constructed, and then the high thermal conductivity composite was obtained by resin perfusion. The effects of the concentration of graphene, the volume ratio of ethanol and water in the mixed solvent, the volatilization temperature on the structure of the three-dimensional assembly and the microstructure of the three-dimensional assembly were studied. The effect of density on the thermal conductivity of composites. The results show that this method not only ensures the good dispersion of graphene, but also realizes the directional arrangement of graphene in polymer matrix to a certain extent. Therefore, graphene based thermal conductive composites with excellent thermal conductivity can be obtained. Using graphene oxide and boron nitride as precursors, a three-dimensional thermal conductivity network of graphene and hexagonal boron nitride can be constructed by hydrothermal method. The effect of the mass ratio of graphene to boron nitride on the thermal conductivity network was studied, and the synergistic effect between graphene and boron nitride was explored. The effect of the mass ratio of graphene oxide to boron nitride on the thermal conductivity and insulation properties of the composites was also discussed. The results show that the composite of graphene and boron nitride can improve the thermal conductivity of the composites, and the thermal conductivity of the composites is better than that of the simple use of graphene.
【學位授予單位】：寧波大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB33

【參考文獻】

相關(guān)期刊論文 前1條

1 Xiang-Fen Jiang;Qunhong Weng;Xue-Bin Wang;Xia Li;Jun Zhang;Dmitri Golberg;Yoshio Bando;;Recent Progress on Fabrications and Applications of Boron Nitride Nanomaterials:A Review[J];Journal of Materials Science & Technology;2015年06期

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本文編號：1977829