Josh Enokida along with Weiguo Hu and Bryan Coughlin have published a paper in Macromolecules investigating structural and dynamic changes in polyisoprene ionomers through systematic variation in counter ion size.  Also contributing to the project were Brian Morgan and Frederick "Rick" Beyer (PSE alum) from the Army Research Laboratory, and Huagao Fang and Henning Winter from UMass Chemical Engineering."