1. Zhejiang Key Laboratory of Bio‐Based Polymeric Materials Technology and Application, Ningbo Key Laboratory of Polymer MaterialsNingbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Ningbo 315201 China
2. Department of Polymer Engineering and Science, School of Materials Science and Chemical EngineeringNingbo University Ningbo 315211 China
3. Shanghai Synchrotron Radiation Facility of Zhangjiang Lab, Shanghai Advanced Research InstituteChinese Academy of Sciences Shanghai 201204 China
4. Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 China