Bio-based, Self-healing Materials (IMAGE) Iowa State University Caption Michael Kessler, left, and former Iowa State doctoral student Will Goertzen use a dynamic mechanical analyzer to measure the mechanical properties of polymers. Credit Photo from Michael Kessler Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.