1. Department of Macromolecular Science and EngineeringCase Western Reserve University Cleveland OH 44106 USA
2. School of Materials Science and EngineeringGeorgia Institute of Technology Atlanta GA 30332‐0245 USA
3. Department of Chemical EngineeringTsinghua University Beijing 100084 China
4. Materials and Manufacturing DirectorateAir Force Research LaboratoryWright‐Patterson AFB Dayton OH 45433 USA