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Influence of Wax Molecular Weights on Wax Migration and Evaporation of Rubber Vulcanizates at Room Temperature  

Im, Song-Hee (Department of Chemistry, Sejong University)
Choi, Sung-Seen (Department of Chemistry, Sejong University)
Publication Information
Elastomers and Composites / v.44, no.4, 2009 , pp. 397-400 More about this Journal
Abstract
Ozone caused the crack on the surface of a rubber article by oxidation of double bond at room temperature. Wax migrates to the surface of a rubber article and makes a physical barrier to prevent process of ozonation. We investigated change of molecular weight distribution of waxes in unfilled NR, SBR, and BR vulcanizates before and after aging at room temperature for 6 months. Migration and evaporation behaviors of wax in a rubber article at ambient conditions help understand a role of wax as an antidegradant and appearance contamination of a rubber article. The relative intensity distribution of n-alkanes of the NR specimen after the aging was shifted to higher molecular weight compared with the relative intensity distribution before the aging, while those of the SBR specimen before and after the aging did not show a big difference.
Keywords
wax; molecular weight; rubber vulcanizate; evaporation; migration;
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