1. Department of Wood Science and Forest Products, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
2. Current address: Eastman Chemicals Division, P.O. Box 1972, Kingsport, TN 37662
3. Polymeric Materials and Interfaces Laboratory, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
4. Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061