Structure and Properties of Nitrile-butadiene Rubber Vulcanizates with Self-healing Capability Based on Coordination Crosslinking
A coordination crosslinked nitrile-butadiene rubber(NBR)vulcanizate with self-healing capability was prepared using CuSO4 as coordination crosslinking agent,and its sulfurization charac-teristics,crosslink density,mechanical properties and self-healing performance of vulcanizate were in-vestigated systematically.The results showed that the successful formation of a coordination crosslinked network in the NBR vulcanizate after hot pressing.When the addition of CuSO4 was 20 phr,the vulcanizate exhibited the highest crosslink density,tensile strength,tear strength and Shore A hardness as observed from the equilibrium swelling test and mechanical properties.During the self-healing performance evaluation,all the NBR vulcanizates demonstrated favorable self-healing behav-ior.With increasing healing temperature or healing time,the healing strength and healing efficiency of the vulcanizates were improved obviously.The vulcanizate with 20 phr of added CuSO4 achieved the highest healing efficiency of 98％when healed at 180 ℃ for 60 min.
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