| 聚乙烯/炭黑/碳纤维复合材料阻温特性 |
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| 引用本文： | 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. |
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| 作者姓名： | 沈烈 徐建文 益小苏 |
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| 作者单位： | 1.浙江大学 高分子科学与工程学系, 杭州 310027; |
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| 基金项目： | 国家 8 6 3计划资助项目 ( 86 3-715 -0 0 7-0 0 80 ) |
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| 摘 要： | 研究了碳纤维对聚乙烯/炭黑复合材料阻温特性的影响,并对导电机理做初步的探讨。由于碳纤维远程导电效应的存在,随着碳纤维含量的增加,复合材料PTC强度增加,PTC转变区域变窄,PTC转变温度移向高温,还有助于提高复合材料的电性能稳定性。
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| 关 键 词： | PTC效应 聚乙烯 炭黑 碳纤维 |
| 文章编号： | 1000-3851(2001)03-0018-04 |
| 收稿时间： | 1999-12-17 |
| 修稿时间： | 1999年12月17 |
RESISTIVITY TEMPERATURE DEPENDENCE OF PE-CARBON-BLACK COMPOSITES MIXED WITH CARBON FIBER |
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| SHEN Lie,XU Jian-wen,YI Xiao-su.RESISTIVITY TEMPERATURE DEPENDENCE OF PE-CARBON-BLACK COMPOSITES MIXED WITH CARBON FIBER[J].Acta Materiae Compositae Sinica,2001,18(3):18-21. |
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| Authors: | SHEN Lie XU Jian-wen YI Xiao-su |
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| Affiliation: | 1.Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027,China;2.National Key Laboratory of Advanced Composites, Beijing 100095,China |
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| Abstract: | The study of the resistivity temperature dependence of polyethylene carbon black composites mixed with different concentrations of carbon fiber is reported. Carbon fibers provide charge transport over large distances, whereas carbon blacks not only provide charge transport over relatively small distances but also improve the interfiber contacts through carbon black particle bridges. Incorporation of carbon fibers into polyethylene carbon black composites can substantially improve the conductivity level of these systems. Only charge transport over relatively small distances is affected by the increasing temperature before PTC transition. Through black particles bridging neighbouring carbon fibers, carbon fiber conductive network can compensate for somewhat conductivity losses resulting from the increasing interparticle distances of carbon black. Resistivity of composites before PTC transition is thus more and more insensitive to temperature change due to the increase of carbon fiber loading. However, in the temperature range of polyethylene melting point, charge transports over large and small distances are both destroyed in the composites. In this case resistivity increases drastically, giving rise to an extremely large PTC anomaly effect. So the positive temperature coefficient of resistance (PTC) effects become stronger, and the PTC transition temperature is increased as concentration of carbon fiber in polyethylene carbon black composite. |
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| Keywords: | PTC effect polyethylene carbon black carbon fiber |
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