Scratch behavior of soft thermoplastic olefins: effects of ethylene content and testing rate Academic Article uri icon


  • Soft thermoplastic olefins (TPOs) consisting of 70 wt.% ethylene-propylene rubber (EPR) and 30 wt.% polypropylene (PP) were subjected to a standardized scratch test (ASTM D7027-05) at three different testing speeds: 1, 10, and 100 mm/s. Two TPO systems were considered for the study: System A having 52 wt.% ethylene in the EPR and System B containing 67 wt.% ethylene. Raising the ethylene content in EPR not only increased the overall blend crystallinity, but also altered the internal morphology of the material. Scratch testing rate appears to impart a significant effect on the scratch behavior of the material. The scratch damage mechanisms and morphology in the above model systems are described and correlated with tensile behavior and mechanical properties to establish a structure-property relationship. Issues regarding scratch properties of the soft TPOs are discussed. 2007 Springer Science+Business Media, LLC.

published proceedings


author list (cited authors)

  • Browning, R. L., Jiang, H., Moyse, A., Sue, H., Iseki, Y., Ohtani, K., & Ijichi, Y.

citation count

  • 28

complete list of authors

  • Browning, Robert L||Jiang, Han||Moyse, Allan||Sue, Hung-Jue||Iseki, Yuki||Ohtani, Kousuke||Ijichi, Yasuhito

publication date

  • February 2008