多壁碳纳米管协同改性及高介电纳米复合材料的制备  

Synergistic Modification of Multi-walled Carbon Nanotubes and Preparation of Nanocomposites with High Dielectric Constant

作　　者：李海[1] 观姗姗[1] 赵树高[1] Guo Laina Li Hai Guan Shanshan Zhao Shugao Guo Laina(Key Laboratory of Rubber-Plastics, Ministry of Education, Qingdao University of Science and Technology, Qingdao 266042, China Hutchinson S.A-Research Center, Chalettesur Loing 45120, France)

机构地区：[1]青岛科技大学橡塑材料与工程教育部重点实验室,青岛266042 [2]Hutchinson S.A-Research Center, Chalette sur Loing 45120

出　　处：《绝缘材料》2017年第2期18-23,共6页Insulating Materials

摘　　要：以硬脂酸(SA)和铝酸酯(ACA)为改性剂,十二烷基苯磺酸钠(SDBS)为表面活性剂对多壁碳纳米管(MWCNTs)进行协同改性。然后以改性碳纳米管为填料,硅橡胶(SR)为基体,通过溶液共混方法制备了MWCNTs/SR复合材料,研究协同改性对MWCNTs/SR复合材料性能的影响。由SEM表征可知,协同改性后碳纳米管在复合材料中的分散性得到改善。通过TGA表征发现,碳纳米管经协同改性之后能显著提高复合材料的热稳定性,与未改性MWCNTs/硅橡胶复合材料相比,其分解温度(T(onset))由438.9℃提高到473.2℃。在100 Hz条件下,MWCNTs/SR复合材料的介电常数由270增至970,增幅高达259%。经协同改性制备的复合材料具有更高的介电常数,且介质损耗基本不变。Multi-walled carbon nanotubes（MWCNTs） were synergistic modified by using stearic acid（SA） and aluminate（ACA） as modifier and sodium dodecyl benzene sulfonate（SDBS） as surfactant. A MWCNTs/SR composite was prepared via solution blending method by using the modified MWCNTs as filler and silicone rubber as matrix, and the effect of synergistic modification on the properties of the MWCNTs/SR composites were analyzed. The SEM result shows that the dispersity of MWCNTs in the composites after surface modification is improved. The TGA result indicates that the thermal stability of the MWCNTs/SR composites is improved after synergistic modification, and the decomposition temperature（T（onset）） increases from 438.9 ℃ to 473.2 ℃. The dielectric constant of the MWCNTs/SR composites increases from 270 to 970 at 100 Hz, which increases by 259%. The composites show higher dielectric constant after synergistic modification, and its dielectric loss does not change basically.

关 键 词：多壁碳纳米管 硅橡胶 溶液共混 协同改性 介电常数 

分 类 号：TM215[一般工业技术—材料科学与工程]