1. CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China; Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843; Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China; and Department of Chemistry, Stony Brook University, Stony Brook, New York 11794