1. Institute of Polymer Science and Polymer Engineering, The University of Akron, 170 University Avenue, Akron, Ohio 44325-3909, United States
2. NIST Center for Neutron Research, Gaithersburg, Maryland 20899, United States
3. Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
4. Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio 45433, United States