Abstract
Ethylene–propylene–diene monomer (EPDM) rubber/samarium borate (SmBO3)/polyolefin and EPDM/antimony-doped tin oxide (ATO)/polyolefin composites are aged at 150°C for different intervals. The addition of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE) and high-density polyethylene (HDPE) can delay the decrease in elongation at the break of EPDM/filler composites in the first 7 days of ageing. Moreover, the risen branch content of polyolefin can cause more crystals melt during ageing. It is found that acidic ATO particles would promote the formation of oxidative products during ageing. The substitution of SmBO3 by acidic ATO can boost the decrease amplitude of elongation at break of EPDM/filler/LDPE, EPDM/filler/LLDPE and EPDM/filler/HDPE in the first 7 days of ageing. The color change is correlated well with the variation in carbonyl index. The crystallinity is mainly influenced by the chemical cross-link points during ageing. The tendency of tensile strength is well consistent with that of swelling ratios, and the electric properties are correlated with increased polar groups and crystallinity.
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