采用熔体共混法制备了炭黑(CB)/高密度聚乙烯(HDPE)导电复合材料.研究了硝酸氧化对CB/HDPE导电复合材料正温度系数(PTC)、负温度系数(NTC)效应和电性能稳定性的影响.结果表明,填充氧化炭黑(CB-O)提高了CB-O/HDPE体系的电性能稳定性和PTC强度,部分消除或降低了复合材料的NTC效应.而CB-O/HDPE体系的室温电阻率比CB/HDPE体系只增加了0.3个数量级,但比经过交联处理的CB/HDPE(CB/crosslinked-HDPE)体系降低了1个数量级.CB-O/HDPE复合材料性能的改善主要是由于CB经氧化后,表面羧基、羟基等极性基团含量增加,抑制了CB粒子高温时的自团聚作用,减弱了体系的NTC效应;同时CB表面微晶晶界处导电性较差区域的减少,提高了CB的导电性,并且CB-O表面大量孔洞和裂缝的形成,增强了CB-O与HDPE的物理吸附作用,提高了复合材料的电性能稳定性.
参考文献
| [1] | Wantenberg M F,Lahlouh J G,Toth J.Conductive polymer composition and device:US,5747147[P].1998-05-05. |
| [2] | Das N C,Chaki T K,Khastgir D.Effect of filler treatment and crosslink on mechanical and dynamic mechanical properties and electrical conductivity of carbon black-filled ethylene-vinyl acetate copolymer composites[J].Journal of Applied Polymer Science,2003,90(8):2073-2082. |
| [3] | Hiroki T,Yoshinori K.Positive temperature coefficient thermistor:US,6617955[P].2003-09-09. |
| [4] | 沈烈,徐建文,益小苏.体积膨胀的稀释作用对聚合物基导电复合材料PTC效应的影响[J].复合材料学报,2001,18(3):34-37.Shen Lie,Xu Jianwen,Yi Xiaosu.Effect of dilution due to thermal volume expansion on PTC effect of the conductive polymer composites[J].Acts Materiae Compositae Sinica,2001,18(3):34-37. |
| [5] | Shen L,Lou Z D,Qian Y J.Effects of thermal volume expansion on positive temperature coefficient effect for carbon black filled polymer composites[J].Journal of Polymer Science Part B:Polymer Physics,2007,45(22):3078-3083. |
| [6] | Ding T H.Wang L H,Wang P.Changes in electrical resistance of carbon-black-filled silicone rubber composite during compression[J].Journal of Polymer Science Part B:Polymer Physics,2007,45(19):2700-2706. |
| [7] | Narkis M,Ram A,Flashner F.Electrical properties of carbon black filled polyethylene[J].Polymer Engineering Science,1978,18(8):649-653. |
| [8] | Bueche F.A new class of switching materials[J].Journal of Applied Physics,1973,44(1):532-533. |
| [9] | 沈烈,徐建文,益小苏.聚乙烯/炭黑/碳纤维复合材料阻温特性[J].复合材料学报,2001,18(3):18-21.Shen Lie,Xu Jianwen,Yi Xiaosu.Resistivity temperature dependence of PE-carbon-black composites mixed with carbon fiber[J].Acta Materiae Compositae Sinica,2001,18(3):18-21. |
| [10] | Narkis M.Vaxman A.Resistivity behavior of filled dectrically conductive crosslinked PE[J].Journal of Materials Science,1984,29(5):1639-1652. |
| [11] | Narkis M,Ram A,Stein Z.Effect of crossiinking on carbon black/polyethylene switching materials[J].Journal of Materials Science,1980,25(7):1515-1518. |
| [12] | Narkis M,Ram A,Stein Z.Electrical properties of CB filled crosslinked PE[J].Journal of Materials Science,1981,21(16):1049-1054. |
| [13] | Suh D J,Park T J,Ihm S K.Effect of surface oxygen groups of carbon supports on the characteristics of Pd/C catalysts[J].Carbon,1993,31(3):427-435. |
| [14] | Hou Yanhui,Zhang Mingqiu,Rong Minzhi.Performance stabilization of conductive polymer composites[J].Journal of Applied Polymer Science,2003,89(9):2438-2445. |
| [15] | 季君晖.炭黑表面性能的表征[J].炭素,1999(4):8-12.Ji Junhui.Characterization of carbon black surface[J].Carbon,1999(4):8-12. |
| [16] | 肖英,李兰英,张瑚,戴晓雁.获取优良分散性炭黑的表面硝酸氧化[J].材料科学与工艺,2005,13(1):75-81.Xiao Ying,Li Lanying,Zhang Rui,Dai Xiaoyan.The nitric acid oxidation of carbon black surface to obtain the good dispersion[J].Materials Science & Technology,2005,13(1):75-81. |
| [17] | Yu Gang,Zhang Mingqiu,Zeng Hanmin.Carbon-black-filled polyolefine as a positive temperature coefficient materials:Effect of composition,processing,and filler treatment[J].Journal of Applied Polymer Science,1998,70(3):559-566. |
| [18] | Yu Gang,Zhang Mingqiu,Zeng Hanmin,Hou Yanhui,Zhang Haibo.Effect of filler treatment on temperature dependence of resistivity of carbon-black-filled blends[J].Journal of Applied Polymer Science,1999,73(4):489-494. |
| [19] | Zhang Jianfeng,Zheng Qiang,Yang Yiquan,Yi Xiaosu.Highdensity polyethytene/carbon black conductive composites Ⅰ:Effect of CB surface modification on its resistivity-temperature behavior[J].Journal of Applied Polymer Science,2002,83(14):3112-3116. |
| [20] | Mather P J,Thomas K M.Carbon black/high density polyethylene conducting composite materials[J].Journal of Materials Science,1997,32(7):1711-1715. |
| [21] | Kamegawa K,Nishikubo K,Yoshida H.Oxidative degradation of carbon blacks with nitric acid Ⅰ:Changes in pore and crystallographic structures[J].Carbon,1998,36(4):433-441. |
| [22] | Sherman R D,Middleman L M,Jacobs S M.Electron transport process in conductor-filled polymers[J].Polymer Engineering and Science,1983,23(1):36-46. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%