Abstract
NR composites were aged at 60 oC for 10 to 185 days and the aged samples were pyrolyzed using pyrolysis-GC/MS. Isoprene, toluene, xylene, 1,4-dimethyl-4-vinylcyclohexene, and 1-methyl-4-(1-methylethenyl)-cyclohexene were detected as the major pyrolysis products. The 1,4-dimethyl-4-vinylcyclohexene and 1-methyl-4-(1-methylethenyl)-cyclohexene are the isoprene dimer species. Peak intensity ratio of the isoprene dimers/isoprene decreased until 100 days of the aging time and then slightly increased. The decreased trend of the isoprene dimers/isoprene ratio before 100 days of the aging time was due to the increased crosslink density by thermal aging. The slightly increased ratio after 100 days of the aging time might be due to the distribution of the free chain length between crosslink points.
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