1. a Maurice Morton Institute and Department of Polymer Science , The University of Akron , Akron, Ohio, 44325-3909
2. b Institute of Chemistry The Chinese Academy of Science , Beijing, 100080, China
3. c NASA Lewis Research Center , Cleveland, Ohio, 44135-3191
4. d Advanced Fire Resistant Materials Fire Research Branch Federal Aviation Administration , Atlantic City, International Airport, New Jersey, 08405