【摘要】 在热氧老化过程中,用过氧化物硫化的镍顺丁橡胶是主链分子发生断裂。在连续化学松弛时不能用单一的 Maxwell 松弛方程描述,它近似的符合下式σ（?）/σ（0）=A₁e^-k₁^t+A₂e^-k₂^t由连续与间歇化学松弛曲线的比较表明,该硫化胶是链断裂反应和交联反应同时发生的,且交联反应速度是逐渐增加的。更多还原

【Abstract】 Peroxide vulcanizate of Ni—catalyzed polybutadiene has C—C crossl-inks.During the oxidative degradation seission reaction occurs onlyalong the main chain at high temperature.According to the Maxwellian decay curve the chemical relaxationapproximately coincides with the following equationσ（t）/σ（0）=e^-xt（1）Upon continuous stress relaxation,its modified equation is express-ed asσ（t）/σ（0）=A₁e^-k₁^t+A₂e^-x₂^t（2）Comparison of the continuous stress relaxation curve with the intermittent one indicates that in the thermo—oxidative process the mainchain scission and crosslinking reaction concur.And the rate of crossl-ink reaction is gradually speeded up in the initiation step.更多还原