【摘要】 本研究系统考察了四硫化双环五次甲基秋兰姆（TRA）用量对氯丁橡胶/顺丁橡胶（CR/BR）共混胶交联网络状态及性能的影响。结果表明，随着TRA用量从0.6份增加至1.4份，共混胶硫化速率显著提升，工艺正硫化时间t₉₀缩短；两相交联密度均提高，但BR相的交联密度变化率达125%，显著高于CR相的15%；共混胶的模量升高而拉断伸长率下降，拉伸强度则呈先升后降趋势，当TRA用量为0.8份时，共混胶的拉伸强度达16.6 MPa，拉断伸长率为315%；动态力学性能分析表明共混胶的损耗因子（tanδ）从0.12降至0.07，动态生热降低；100 ℃×48 h热氧老化后，共混胶的硬度与定伸应力均提高，而拉断伸长率显著下降，其中BR相的交联密度变化率显著高于CR相。更多还原

【Abstract】 This study systematically investigated the influence of the amount of thiuram tetrasulfide （TRA） on the crosslinking network state and properties of chloroprene rubber/cis-polybutadiene rubber （CR/BR） blends.The results showed that as the TRA content increased from 0.6 parts to 1.4 parts,the vulcanization rate of the blend significantly increased,and the process positive vulcanization time t₉₀ was shortened;the crosslinking density of both phases increased,but the change rate of the crosslinking density in the BR phase reached 125%,significantly higher than that in the CR phase （15%）;the modulus of the blend increased while the elongation at break decreased,and the tensile strength showed a trend of first increasing and then decreasing.When the TRA content was 0.8 parts,the tensile strength of the blend reached 16.6 MPa,and the elongation at break was 315%;dynamic mechanical property analysis indicated that the loss factor （tanδ） of the blend decreased from 0.12 to 0.07,and dynamic heat build-up was reduced;after thermo-oxidative aging at 100 ℃ for 48 hours,the hardness and modulus at a fixed extension of the blend increased,while the elongation at break significantly decreased,with the change rate of the crosslinking density in the BR phase significantly higher than that in the CR phase.更多还原