1. School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325, United States
2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai 201620, China
3. National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States