Novel mixed antioxidants composed of antioxidant IPPD and lanthanum (La) complex were added as a
filler to form natural rubber (NR) composites. Mechanical testing was carried out before and after the
thermo-oxidative aging of NR composites. Fourier transform infrared spectroscopy with attenuated total
reflectance (FTIR-ATR) was performed to observe the variation of internal groups. The thermal and
thermo-oxidative decomposition of NR were investigated by thermogravimetric (TG) curves, and the
thermo-oxidative aging kinetic parameters were determined by the Flynn-Wall-Ozawa (FWO) method.
The results showed that the thermo-oxidative degradation of NR composites was a two-stage reaction.
Compared with the pure antioxidant IPPD, the same mass of mixed antioxidants had better effects to
improve the mechanical properties of NR composites, reduce the formation of aging products, and increase
the activation energies (Ea) of the thermo-oxidative degradation. Based on the autocatalytic, free
radical chain reaction of the thermo-oxidative aging of NR, different function mechanisms of antioxidant
IPPD and La complex were also compared. As a result of strong coordination abilities, large coordination
numbers, and decomposition of the hydroperoxides, this new rare-earth antioxidant could indeed
enhance the thermo-oxidative aging resistance of NR composites. This research has important significance
for the exploitation of rubbers with high resistance to thermo-oxidative aging.
© 2015 Elsevier Ltd. All rights reserved
Novel mixed antioxidants composed of antioxidant IPPD and lanthanum (La) complex were added as afiller to form natural rubber (NR) composites. Mechanical testing was carried out before and after thethermo-oxidative aging of NR composites. Fourier transform infrared spectroscopy with attenuated totalreflectance (FTIR-ATR) was performed to observe the variation of internal groups. The thermal andthermo-oxidative decomposition of NR were investigated by thermogravimetric (TG) curves, and thethermo-oxidative aging kinetic parameters were determined by the Flynn-Wall-Ozawa (FWO) method.The results showed that the thermo-oxidative degradation of NR composites was a two-stage reaction.Compared with the pure antioxidant IPPD, the same mass of mixed antioxidants had better effects toimprove the mechanical properties of NR composites, reduce the formation of aging products, and increasethe activation energies (Ea) of the thermo-oxidative degradation. Based on the autocatalytic, freeradical chain reaction of the thermo-oxidative aging of NR, different function mechanisms of antioxidantIPPD and La complex were also compared. As a result of strong coordination abilities, large coordinationnumbers, and decomposition of the hydroperoxides, this new rare-earth antioxidant could indeedenhance the thermo-oxidative aging resistance of NR composites. This research has important significancefor the exploitation of rubbers with high resistance to thermo-oxidative aging.© 2015 Elsevier Ltd. All rights reserved
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