Surface resistivity of carbonaceous fiber/PTFE antistatic coatings
来源期刊：中南大学学报(英文版)2014年第5期
论文作者：ZHANG Shan(张姗) WANG Cheng-guo(王成国) YUAN Hua(袁华) ZHU Bo(朱波) YU Mei-jie(于美杰) ZHANG Bing-ming(张丙明) HAN Rong-heng(韩荣恒) LI Yong-wei(李永威)
文章页码：1689 - 1695
Key words：carbonaceous fiber; antistatic coatings; surface resistivity; pigment; mechanism
Abstract: PAN (Polyacrylonitrile)-based carbonaceous fibers were prepared at the heat treatment temperature (HTT) range of 650 to 900 oC. The relationships among HTT, carbon content and volume resistivity of the carbonaceous fibers were investigated. The carbonaceous fibers/PTFE (Polytetrafluoroethylene) antistatic coatings were prepared by the spraying technology and the effects of carbonaceous fibers and pigments on surface resistivity of the coatings were systematically discussed. Micrographs provide insight into the antistatic mechanism of the coating. The results show that carbon content of the carbonaceous fibers increases from 68.8% to 74.8% (mass fraction) and the volume resistivity decreases drastically from 1.94×103 to 8.27×10-2 Ω·cm. The surface resistivity of the antistatic coating is adjustable between 105 and 108 Ω to fit the different antistatic materials. Static is dissipated by a conductive network of short fibers and the tunneling effect between the neighboring fibers and conductive pigments. Conductive pigments make the conductive network more perfect and improve the antistatic ability, but insulating pigments acting as barriers for the formation of conductive channel increases the surface resistivity of the coatings. The influence of pigments on the surface resistivity drops gradually with the decrease of the carbonaceous fibers volume resistivity.
ZHANG Shan(张姗)1, 2, WANG Cheng-guo(王成国)2, YUAN Hua(袁华)2, ZHU Bo(朱波)2, YU Mei-jie(于美杰)2, ZHANG Bing-ming(张丙明)2, HAN Rong-heng(韩荣恒)3, LI Yong-wei(李永威)3
(1. Key Laboratory for Liquid-Solid structured Evolution and Processing of Materials of
Ministry of Education (Shandong University), Jinan 250061, China;
2. Carbon Fiber Engineering Research Center, Faculty of Materials Science, Shandong University, Jinan 250061, China;
3. Shandong Yingli Industrial Co., Ltd., Weifang 262714, China)
Abstract:PAN (Polyacrylonitrile)-based carbonaceous fibers were prepared at the heat treatment temperature (HTT) range of 650 to 900 oC. The relationships among HTT, carbon content and volume resistivity of the carbonaceous fibers were investigated. The carbonaceous fibers/PTFE (Polytetrafluoroethylene) antistatic coatings were prepared by the spraying technology and the effects of carbonaceous fibers and pigments on surface resistivity of the coatings were systematically discussed. Micrographs provide insight into the antistatic mechanism of the coating. The results show that carbon content of the carbonaceous fibers increases from 68.8% to 74.8% (mass fraction) and the volume resistivity decreases drastically from 1.94×103 to 8.27×10-2 Ω·cm. The surface resistivity of the antistatic coating is adjustable between 105 and 108 Ω to fit the different antistatic materials. Static is dissipated by a conductive network of short fibers and the tunneling effect between the neighboring fibers and conductive pigments. Conductive pigments make the conductive network more perfect and improve the antistatic ability, but insulating pigments acting as barriers for the formation of conductive channel increases the surface resistivity of the coatings. The influence of pigments on the surface resistivity drops gradually with the decrease of the carbonaceous fibers volume resistivity.
Key words:carbonaceous fiber; antistatic coatings; surface resistivity; pigment; mechanism
