1. Department
of Chemistry, Southern Methodist University, 3215 Daniel Avenue,
Dallas, Texas 75275-0314, United States
2. School of Polymers and High
Performance Materials, The University of Southern Mississippi, Hattiesburg, Mississippi 39406, United States
3. George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science and Engineering, Department of Chemistry, University of Florida, PO Box 117200, Gainesville, Florida 32611-7200, United States