碳纳米管填充硅橡胶复合材料导热性能的实验研究

发布时间：2018-04-17 15:50

  本文选题：硅橡胶 + MWNTs　； 参考：《青岛科技大学》2015年硕士论文

【摘要】：随着数据化时代的来临,科学技术对于高度集成元器件的要求越来越高,这直接导致了对于高导热材料的需求越来越迫切,而硅橡胶作为一种具备优异性能的高弹性材料,其导热性能也得到了广泛研究。本课题以107双组分缩合型硅橡胶为基胶,探究了交联剂原硅酸乙酯和催化剂二丁基二月桂酸锡的加入量对无填充硅橡胶导热率的影响,结果表明,当二者加入量分别为3.6phr和10.9phr时,硅橡胶的交联密度最大,且导热率最高,二者呈对应关系。本文探究了不同溶剂对于碳纳米管的分散性的影响,进而制备MWNTs/107胶复合材料。结果表明,异丙醇对于碳纳米管的分散性最好,且以异丙醇为溶剂制出的复合材料导热率最高。为使Fe3O4粒子足量、均匀且牢固地附着于碳纳米管表面,本文以溶剂热反应制备Fe3O4/MWNTs复合粒子。研究流程为先对MWNTs进行了表面功能化处理,然后以溶剂热法生成Fe3O4粒子并使其附着于MWNTs表面。TEM表征结果说明,用SDS对酸化后的MWNTs进行功能化处理,能提高MWNTs在溶液中的分散性,并能使Fe3O4粒子最稳定的附着于MWNTs表面,热重分析实验证明,在使用SDS之后,MWNTs表面的Fe3O4粒子生成量也得到提高；当用0.002mol的三价铁盐对0.1gMWNTs进行包覆实验时,所制得的当Fe3O4粒子生成量较为理想,且粒径适中。本文研究了MWNTs对于107硅橡胶复合材料导热率的影响。当MWNTs管径大于60nm时,复合材料导热率随MWNTs填充量增大而一直呈上升趋势；而当MWNTs管径小于60nm时,且填充量为4phr时,MWNTs在硅胶基体中出现团聚,导热网络受到破坏,复合材料导热率会出现下降趋势,而随着填充量的继续增多,导热网络得到完善,导热率开始增大。本文研究了取向MWNTs对于107硅橡胶复合材料导热率的影响,与非取向MWNTs相比,其对于复合材料导热率的提升更为明显,由于取向碳纳米管在硅橡胶基体中的分散性得到改善,团聚现象减弱,所以随着填充份数的增加,没有出现导热率下降的现象。
[Abstract]:With the advent of data age, the requirement of high integrated components is becoming more and more high, which directly leads to the urgent need for high thermal conductivity materials, and silicone rubber as a kind of high elastic material with excellent performance.Its thermal conductivity has also been extensively studied.Based on 107 binomial condensed silicone rubber, the effect of crosslinking agent, ethyl orthosilicate, and catalyst 2 Ding Ji on the thermal conductivity of unfilled silicone rubber was studied.When 3.6phr and 10.9phr were added, the crosslinking density of silicone rubber was the highest and the thermal conductivity was the highest.In this paper, the influence of different solvents on the dispersion of carbon nanotubes (CNTs) was investigated, and the MWNTs/107 composite was prepared.The results show that isopropanol has the best dispersion to carbon nanotubes and the thermal conductivity of composites prepared with isopropanol as solvent is the highest.In order to make the Fe3O4 particles adhere to the carbon nanotube surface uniformly and firmly, the Fe3O4/MWNTs composite particles were prepared by solvothermal reaction.The surface functionalization of MWNTs was carried out first, and then Fe3O4 particles were formed by solvothermal method and attached to MWNTs surface. The results showed that SDS functionalization of MWNTs after acidification could improve the dispersion of MWNTs in solution.The results of thermogravimetric analysis show that the amount of Fe3O4 particles on the surface of Fe3O4 is also increased after the use of SDS, and that when the trivalent ferric salts of 0.002mol are used in the coating experiment of 0.1gMWNTs,The yield of Fe3O4 particles is ideal and the particle size is moderate.The effect of MWNTs on the thermal conductivity of 107 silicone rubber composites was studied in this paper.When the diameter of MWNTs pipe is larger than that of 60nm, the thermal conductivity of composite material increases with the increase of MWNTs content, but when the diameter of MWNTs pipe is smaller than 60nm, and the content of 4phr is less than 4phr, the thermal conductivity network is destroyed.The thermal conductivity of composites will decrease, but with the increase of the filling amount, the thermal conductivity network will be improved and the thermal conductivity will increase.In this paper, the effect of oriented MWNTs on the thermal conductivity of 107silicone rubber composites is studied. Compared with non-oriented MWNTs, the thermal conductivity of the composites is increased more obviously, and the dispersion of oriented carbon nanotubes in silicone rubber matrix is improved.The agglomeration decreases, so there is no decrease in thermal conductivity with the increase of filling fraction.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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