Variation of Pyrolysis Pattern of Polyisoprene Depen

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 fil领 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. 居里点热裂解仪