Their structures were
characterized by Fourier transform infrared spectroscopy (FT-IR),
proton nuclear magnetic resonance (1H NMR) and matrix-assisted
laser desorption/ionization time-of-flight mass spectrometry
(MALDI-TOF-MS). In addition, antioxidative abilities of the GM-MEIPDI
and GM-ME-TDI in natural rubber (NR) were evaluated by
accelerated thermal aging and oxidation induction time (OIT) tests,
and their possible antioxidative mechanisms during NR degradation
were also proposed.