Polymer00023 - containing aromatic substituent (e.g.,...

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12 N N N O O O Figure 1.5 Structure of triallyl isocyanurate (TAIC). In a study of peroxide curing of bromine-containing fluoroelastomers, DuPont researchers obtained satisfactory cures with aliphatic peroxides 2,5- dimethyl-2,5-di- t - butylperoxyhexane, and 2,5-dimethyl- 2,5-di- t butylperoxyhex-3-yne, available from Atochem as Luperco 101XL and 130XL (45% active ingredient on inert support) (Moore 2005). These peroxides have a half life of 0.8 and 3.4 minutes at 177 °C, respectively. Lower molecular weight aliphatic peroxides such as di- t -butylperoxide were found to be active, but too volatile, being partially lost during compound mixing. Peroxides
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Unformatted text preview: containing aromatic substituent (e.g., dicumyl peroxide), gave variable results, probably because of excessive acid-catalyzed decomposition in the fluoroelastomer matrix. Of the radical traps tested, the most effective crosslinker is TAIC, as judged by cure state and compression set of vulcanizates. Other effective crosslinkers contain unhindered allyl or vinyl groups attached to N, O, or Si; all are electron-rich groups. Electron-poor traps are effective in hydrocarbon elastomers, such as m-phenylene-bis-maleimide, are ineffective...
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This note was uploaded on 08/18/2011 for the course MATSE 447 taught by Professor Colby,r during the Spring '08 term at Pennsylvania State University, University Park.

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