High-temperature stability, pyrolysis kinetics and mechanism between
bio-based and petro-based resins using TG-FTIR/MS
Pyrolysis behavior of bio-based resins is of increasing interest due to
their great potential in environmentally friendly and high-temperature
application. Herein, the high-temperature stability, pyrolysis kinetics
and mechanism of rosin glyceride (RGE), hydrogenated rosin glyceride
(HRGE), C9 petro-based resin (C9PR) and hydrogenated C9 petro-based
resin (HC9PR) under non-oxidizing atmosphere were investigated by
TG-FTIR/MS techniques. Based on the non-isothermal TG data, activation
energy was calculated by Friedman and Starink methods, and the
reaction-order model of f(α)=(1-α)n was found to be the most probable
pyrolysis mechanism for different resins, which was also supported by
the TG-FTIR/MS results showing only a dominating pyrolysis peak.
Furthermore, thanks to the unique tricyclic phenanthrene structures,
bio-based resins exhibit better high-temperature stability than
petro-based resins, with an initial skeleton cracking temperature of 623
K and 573 K, respectively. High-temperature stability of resins would
mildly decrease after hydromodification due to weak bonds cracking.
Possible pyrolysis pathways were proposed.