1. 1Naval Research Laboratory, Code 6120, Washington DC 20375-5342; email: roland@nrl.navy.mil
2. 2Bridgestone/Firestone Research, Inc., 1200 Firestone Parkway, Akron, OH 44317-0001
3. 3Sid Richardson Carbon Co., 4825 N. Freeway, Fort Worth, TX 76106
4. 4Department of Polymer Science, University of Akron, Akron, OH 44325-3909