1. CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Advanced Materials Research Center, Petrochemical Research Institute, PetroChina Company Limited, Beijing 102206, China
4. Spallation Neutron Source Science Centre, Dongguan 523803, China
5. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Mater Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
6. Laboratoire Léon Brillouin, UMR 12 CEA-CNRS-UPSay, CEA Saclay, 91191 Gif-sur-Yvette, France