硫酸铜/二硫化四甲基秋兰姆配位交联丁腈橡胶硫化胶的弱化Mullins效应

采用硫酸铜/二硫化四甲基秋兰姆(TMTD)配位交联制备了丁腈橡胶(NBR)硫化胶,对不同TMTD用量下混炼胶的硫化特性和硫化胶的力学性能及压缩模式下的弱化Mullins效应进行了研究.结果表明,二价铜离子和TMTD通过协同作用生成的Cu(SnCNMe2)]·2+络合物与氰基配位交联形成了三维网络结构.随着TMTD用量...

Weakening Mullins effect of coordination crosslinked nitrile rubber/copper sulfate/tetramethylthiuram disulfide vulcanizates

The nitrile rubber （NBR） vulcanizates were prepared by coordination crosslinking of copper sulfate（CuSO4）/tetramethylthiuram disulfide（TMTD）. The vulcanization characteristics, mechanical properties and weakening Mullins effect under compression mode of the vulcanizates with different TMTD amounts were investigated the. The results showed that the Cu（SnCNMe2）]·2+ complex formed by the synergistic effect of Cu2+ and TMTD was crosslinked with cyano group to form a three-dimensional network structure；the crosslinking density of NBR vulcanizates increased with increasing TMTD amounts；the Mullins effect of NBR vulcanizates was significantly obvious during the uniaxial cyclic compression, but could be weakened with increasing TMTD amount. Moreover, the maximum compressive stress under the same strain decreased with increasing the number of cycle times, which showed the stress softening phenomenon， and the instantaneous residual compression deformation increased with increasing the number of cycle times. The decrease range of maximum compressive stress and the increase range of instantaneous compression residual deformation were increased with increasing strain, and the Mullins effect was more remarkable. However, the decrease range of maximum compressive stress and the increase range of instantaneous compression residual deformation were weakened with increasing TMTD amount, and the Mullins effect was significantly weakened.