1. Electrical Insulation Research Center, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA
2. Department of Electrical and Computer Engineering, University of Connecticut, Storrs, Connecticut 06269, USA
3. Polymer Program, University of Connecticut, Storrs, Connecticut 06269, USA
4. US Naval Research Laboratory, Washington, DC 20375, USA
5. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA