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  

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

作　　者：李嘉豪 蔺玉胜[1] 黄萍 王兆波[1] LI Jia-hao;LIN Yu-sheng;HUANG Ping;WANG Zhao-bo(College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《合成橡胶工业》2022年第1期23-28,共6页China Synthetic Rubber Industry

基　　金：山东省自然科学基金资助项目(ZR 2017 MEM 021)。

摘　　要：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(SnCNMe_(2))]·^(2+)络合物与氰基配位交联形成了三维网络结构。随着TMTD用量的增加,NBR硫化胶的交联密度得到提高。在单轴循环压缩过程中,NBR硫化胶产生了明显的Mullins效应,且随TMTD用量增加而明显减弱。同一应变下的最大压缩应力随着循环次数的增加而下降,表现出应力软化现象,瞬时残余压缩形变随循环次数的增加而增大;随着应变的提高,最大压缩应力的下降幅度和瞬时残余压缩形变的增加幅度增大,Mullins效应更加明显;但是随着TMTD用量的增加,最大压缩应力的下降幅度和瞬时残余压缩形变的增加幅度减小,Mullins效应得以明显弱化。The nitrile rubber(NBR)vulca-nizates were prepared by coordination crosslinking of copper sulfate(CuSO_(4))/tetramethylthiuram disulfide(TMTD).The curing characteristics of the compounds,mechanical properties and weakening Mullins effect under compression mode of the vulca-nizates with different TMTD amounts were investiga-ted.The results showed that the[Cu(SnCNMe_(2))]·^(2+)complex formed by the synergistic effect of Cu^(2+)and TMTD was crosslinked with cyano group to form a three-dimensional network structure;the crosslin-king 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 number of cycle times,which showed the stress softening phenomenon,and the instantaneous residual compression deformation increased with increasing 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.

关 键 词：配位交联 丁腈橡胶 二硫化四甲基秋兰姆 力学性能 弱化Mullins效应 协同效应 

分 类 号：TQ333.7[化学工程—橡胶工业]