【摘要】 通过动态硫化法制备了羧基丁腈橡胶/聚酰胺12(XNBR/PA12)热塑性硫化橡胶（TPV），考察了XNBR羧基含量和XNBR/PA12橡塑比（质量比，下同）对TPV力学性能、流变性能、耐油性能和耐热空气老化性能的影响。结果表明，随着橡塑比的增大，TPV力学性能先上升后下降；当XNBR羧基含量为7%（质量分数，下同）、橡塑比为50/50时，TPV的拉伸强度、断裂伸长率分别为20.3 MPa和184%，综合力学性能达到最佳；TPV的复数黏度和储能模量随着橡塑比的增大呈上升趋势；耐油性能和耐老化性能随橡塑比的增大呈下降趋势，其中橡塑比为40/60时TPV样品耐油性能和耐老化性能最佳，且XNBR羧基含量高的TPV耐老化性能更好。更多还原

【Abstract】 The effects of carboxylation rate and mass ratio of rubber to plastic on the mechanical properties,rheological properties,oil resistance,and hot air aging properties of dynamically vulcanized carboxylated nitrile rubber(XNBR)/polyamide 12(PA12)thermoplastic vulcanizate(TPV)were investigated. The results indicated that the TPV exhibited tensile strength of 20. 3 MPa and elongation at break of 184 % when the carboxyl group content of XNBR had 7 wt%and the mass ratio of rubber to plastic was 50/50,presenting optimal comprehensive mechanical properties. Its mechanical properties increased at first and then tended to decrease with an increase in the mass ratio of rubber to plastic. Rheological results indicated that the complex viscosity and storage modulus of the TPV increased with an increase in the mass ratio of rubber to plastic. The oil resistance and air aging resistance of the TPV decreased with an increase in the mass ratio of rubber to plastic and reached optimal values at the mass ratio of 40 to 60. The TPV containing a higher carboxylation rate in XNBR exhibited better aging resistance.更多还原