Electrical Properties of Insulator-Conductor Composites

绝缘体-导体复合材料的电性能

• 批准号: 0076153
• 负责人: Rosario Gerhardt
• 金额: $ 33万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-12-15 至 2005-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0076153&HistoricalAwards=false
• 关键词: Electrical; Properties; Insulator; Conductor; Composites

The main objective of this project is to investigate the electrical properties of insulator-conductor composites using dielectric and impedance spectroscopy as the primary experimental tool and finite element modeling as the primary computer simulation tool. A series of carbon black-polymer composites with varying volume fractions will be fabricated and tested. Once the percolation thresholds have been identified, a large number of samples with the critical volume fraction of carbon black will be prepared and tested. Multiplane analysis of the dielectric functions (permittivitty, impedance, electric modulus and admittance) will also be done and modeled for all samples tested. The microstructure of all measured samples will be evaluated and quantitative correlations between the electrical data and the microstructural parameters will be made (e.g. size, distribution, connectivity). The microstructural results will be used as input for the finite element modeling to further refine the interpretation. It is expected that this project will help determine the significance of the percolation parameters as they relate to the actual microstructure of materials. This project will train up to 3 graduate students in this subject matter.%%%Percolation in conductor-insulator mixtures is the subject of this project. Distribution of telephone lines in a network helps explain percolation. The basic concept is that if all the necessary connections are made, a phone call placed in Vancouver will reach Atlanta instantaneously. If any connections are broken or are inoperative, the phone call does not complete and the desired communication is broken. This concept can be applied to many other problems in a variety of fields. In this project, percolation will be studied by evaluating the electrical conductivity of mixtures of insulating and conducting particles. Even though percolation has been studied for many years, most previous work has only considered direct current behavior. The main objective of this project is to evaluate the effect of frequency (alternating current) on the percolation behavior. Both experimental measurements and computer simulations of idealized insulator-conductor mixtures will be used. This project will train up to 3 graduate students in this subject matter.***

该项目的主要目标是使用介电和阻抗谱作为主要实验工具，有限元建模作为主要计算机仿真工具，研究绝缘体-导体复合材料的电气性能。将制造和测试一系列具有不同体积分数的炭黑-聚合物复合材料。一旦确定了逾渗阈值，将制备和测试大量具有临界炭黑体积分数的样品。 还将对所有受试样品进行介电函数（介电常数、阻抗、电模量和导纳）的多平面分析和建模。将对所有测量样品的微观结构进行评价，并将在电气数据和微观结构参数（例如尺寸、分布、连通性）之间建立定量相关性。 微观结构结果将用作有限元建模的输入，以进一步完善解释。 预计该项目将有助于确定渗流参数的意义，因为它们与材料的实际微观结构有关。这个项目将培养3名研究生在这一主题。%导体-绝缘体混合物中的逾渗是本项目的主题。电话线在网络中的分布有助于解释渗透现象。其基本概念是，如果所有必要的连接，在温哥华的电话将立即到达亚特兰大。 如果任何连接中断或被中断，电话呼叫将无法完成，并且所需的通信将中断。 这个概念可以应用于各种领域的许多其他问题。 在本项目中，将通过评估绝缘和导电颗粒混合物的导电性来研究渗流。 尽管渗流已经研究了很多年，但大多数以前的工作只考虑了直流行为。 该项目的主要目的是评估频率（交流电）对渗流行为的影响。 实验测量和计算机模拟的理想化的绝缘体-导体混合物将被使用。 该项目将在这一主题方面培训多达3名研究生。