Abstract
ABSTRACTSulphonic lanthanum complex based on C-methylcalix[4]resorcinarene (CMCR-La) was synthesised for the thermal-oxidative aging resistance of natural rubber. The structure of CMCR-La was confirmed by FT-IR, 13C NMR and element analysis. TG analysis revealed CMCR-La possessed better thermal stability than commercial antioxidant BHT. Accelerated thermal aging tests and oxidation induction time indicated that CMCR-La could obviously improve the thermal-oxidative aging resistance of NR vulcanisates, which was due to multi-phenolic groups, higher molecular weight, the binding and scavenging effect of La ions on free radicals as well as the extra steric hindrance for phenolic groups.
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