|
|||||
|
|
| 膨胀石墨/聚酯导电复合材料的制备与导电行为 | |
| 引用本文： | 李大军,严长浩,鲁萍,周岚,吴德峰,张明. 膨胀石墨/聚酯导电复合材料的制备与导电行为[J]. 复合材料学报, 2008, 25(1): 35-39 |
| 作者姓名： | 李大军 严长浩 鲁萍 周岚 吴德峰 张明 |
| 作者单位： | 1. 扬州大学,化学化工学院,扬州,225002 2. 扬州大学,化学化工学院,扬州,225002;扬州大学,江苏省环境材料与环境工程重点实验室,扬州,225002 3. 扬州大学,物理科学与技术学院,扬州,225002 |
| 基金项目： | 扬州市-扬州大学科研合作基金（HK0412213） |
| 摘 要： | 采用熔融共混法制备了膨胀石墨 ( EG) /聚酯 ( PET) 导电复合材料。利用扫描电镜及电导率测试等研究了复合材料的制备方法对其结构形态和导电性能的影响。结果表明, EG与聚合物基体间的相互作用和机械剪切力使PET分子能够进入EG的片层和孔隙中 , 促进了导电网络的形成, 导致EG/PET复合材料具有较低的逾渗值, 仅为3. 14 %。环氧树脂 ( ER) 与EG间的强相互作用使其易于对EG插层和剥离, 使ER-EG/PET体系的逾渗值进一步降低到1. 80 %。运用统计逾渗理论分析了材料的导电机制。发现复合材料电导率的各向异性、复杂的微观结构以及在高于逾渗值仍存在隧道导电是临界指数高于普适值的主要原因。 |
| 关 键 词： | 膨胀石墨 导电复合材料 逾渗理论 临界指数 |
| 文章编号： | 1000-3851（2008）01-0035-05 |
| 收稿时间： | 2007-05-09 |
| 修稿时间： | 2007-06-18 |
Preparation and conductive behavior of expanded graphite/poly-(ethylene terephthalate) conductive composites |
|
| LI Dajun,YAN Changhao,LU Ping,ZHOU Lan,WU Defeng,ZHANG Ming. Preparation and conductive behavior of expanded graphite/poly-(ethylene terephthalate) conductive composites[J]. Acta Materiae Compositae Sinica, 2008, 25(1): 35-39 | |
| Authors: | LI Dajun YAN Changhao LU Ping ZHOU Lan WU Defeng ZHANG Ming |
| Affiliation: | (1 College of Chemist ry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China ;2 The Key Laboratory of Environmental Material and Engineering of Jiangsu Province, Yangzhou University, Yangzhou 225002, China ;3 College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China) |
| Abstract: | Expanded graphite/ poly (ethylene terephthalate) ( EG/ PET) conductive composites were prepared bythe melt2blending method. The effect s of the preparation method on the microst ructures and conductivity properties of the composites were studied by scanning elect ron microscopy (SEM) and conductivity measurement . The results show that the graphite nanosheet s are effectively dispersed in the PET mat rix with the assistance of the shear effect on EG and the interaction between EG and PET , which promotes the formation of the conductive network and makes the percolation threshold value of EG/ PET composites only 3. 14 %. The st rong mutual effect s between the epoxy group and the functional group s on EG surface cause the epoxy resin to exert more exfoliation effect on EG,which leads to the percolation value to descend to 1. 80 %. Using the classic statistic percolation theory , the conductivi2 ty behavior of the composites was investigated. The nonuniversal critical exponent ( t) should be at t ributed to the anisot ropy of conductivity , the existence of the tunneling conduction above the percolation threshold and the particular structure. |
| Keywords: | expanded graphite conductive composites percolation theory critical exponent |
| 本文献已被 维普 万方数据 等数据库收录！ | |
| 点击此处可从《复合材料学报》浏览原始摘要信息 | |
| 点击此处可从《复合材料学报》下载免费的PDF全文 | |