Scratch behavior of soft thermoplastic olefins: effects of ethylene content and testing rate |
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Authors: | Robert L Browning Han Jiang Allan Moyse Hung-Jue Sue Yuki Iseki Kousuke Ohtani Yasuhito Ijichi |
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Affiliation: | (1) Polymer Technology Center, Department of Mechanical Engineering, Texas A&M University, College Station, TX, 77843-3123, USA;(2) Sumitomo Chemical America, New York, NY, USA;(3) Sumitomo Chemical Company, Chiba, Japan |
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Abstract: | 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. |
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