1. Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, United States
2. National Synchrotron Radiation Lab, CAS Key Laboratory of Soft Matter Chemistry, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, University of Science and Technology of China, Hefei, P. R. China
3. Advanced Processing Technology Unit, Research Center, Toyobo Co., Ltd. 2-1-1 Katata, Otsu, Shiga 520-0292, Japan
4. RIKEN CLST-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan