基于配位交联的自愈合丁腈橡胶硫化胶的结构与性能

Structure and Properties of Nitrile-butadiene Rubber Vulcanizates with Self-healing Capability Based on Coordination Crosslinking

以无水硫酸铜(CuSO_(4))为配位交联剂,与丁腈橡胶(NBR)混炼后制备了一种具有自愈合性能的配位交联NBR硫化胶,研究了其硫化特性、交联密度、力学性能和自愈合行为。结果表明,热压后NBR硫化胶内形成了配位交联网络;当CuSO_(4)用量为20份时,硫化胶的交联密度、拉伸强度、撕裂强度和Shore A硬度最高;系列NBR硫化胶均表现出良好的自愈合性能,且随着愈合温度和愈合时间的增加,硫化胶的愈合强度和愈合效率显著提高;CuSO_(4)用量为20份的硫化胶在180℃愈合60 min时的愈合效率最高可达到98%。

A coordination crosslinked nitrile-butadiene rubber(NBR)vulcanizate with self-healing capability was prepared using CuSO_(4) as coordination crosslinking agent,and its sulfurization characteristics,crosslink density,mechanical properties and self-healing performance of vulcanizate were investigated systematically.The results showed that the successful formation of a coordination crosslinked network in the NBR vulcanizate after hot pressing.When the addition of CuSO_(4) 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 behavior.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 CuSO_(4) achieved the highest healing efficiency of 98%when healed at 180℃for 60 min.