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The use of pyrolysis-gas chromatography (pyrolysis-GC) for the characterization and analysis of polymers has been used since the development of the technique in 1959. A number of different pyrolyzer designs are currently in general use, each with its own advantages and disadvantages. The major types are resistive filament, Curie point, and furnace pyrolyzers. Pyrolysis-GC, pyrolysis-mass spectrometry (MS), and pyrolysis-GC/MS have been used for decades to elucidate the structures of rubbers. The mechanism for the pyrolysis of polyisoprene has been studied by several groups. The main volatile products formed from polyisoprene by pyrolysis are isoprene and isoprene dimer species. Chien and Kiang11 identified and quantitatively analyzed volatile products obtained from polyisoprene by pyrolysis at 315-384 oC using pyrolysis GC. Matheson and coworkers studied the effect of carbon black filling on the pyrolysis behavior of natural and synthetic rubbers at 850 oC. Ghebrehiwet and coworkers studied analysis of rubber blends using pyrolysis technique coupled with GC/MS at 600 oC. Amounts of volatile products formed from a novolak rein by pyrolysis and their pyrolysis patterns depend on pyrolysis temperatures. Pyrolysis pattern of polyisoprene will also varies depending on the pyrolysis temperature. However, detail studies about this have not been performed. In the present work, the influence of the pyrolysis temperature on the pyrolysis pattern of polyisoprene (the kinds and the relative abundances of the volatile products) was studied using pyrolysis-GC.
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