Abstract
AbstractExtender oil bloomed on the surface of ethyleneâpropyleneâdiene rubber (EPDM) vulcanizates has been analyzed by a dissolution/size exclusion chromatographic (SEC) method. Dissolution is here defined as the quantitative and selective removal of bloomed extender oil from the vulcanizates. The rate of migration of three potentially useful extender oils for windshieldâwiper materials has been determined by the method. In this work a bloomed oil includes both an excluded oil surfaced during the process of vulcanization and a migrated oil surfaced during the course of aging or weathering. Typical initial rates of oil migration in the presence and absence of an excluded oil on the surface of compressionâset EPDM vulcanizates were ca. 0.8 and 2.2 ÎŒg/cm2/h at 25°C, respectively. The rate of migration at an attained uniform oil concentration was found to be ca. 0.5 ÎŒg/cm2/h for the three extender oils.
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