乙烯-乙酸乙烯酯共聚物/氢化丁腈橡胶共混物的相态结构和低温性能研究

采用熔融共混法制备乙烯-乙酸乙烯酯共聚物（EVM）/氢化丁腈橡胶（HNBR）共混物，研究其硫化特性、相态结构、动态力学性能、物理性能和低温拉伸性能。结果表明：当EVM/HNBR共混比为70/30时，EVM形成连续相，HNBR形成分散相；随着HNBR用量的增大，HNBR相态由分散相向连续相转变。HNBR的加入可以提高EVM的耐低温性能，当EVM/HNBR共混比为30/70时，共混物-40 ℃下的低温拉断伸长率可达300%左右。差示扫描量热分析表明，随着HNBR用量的增大，共混物玻璃化温度降低。;The curing characteristics， morphology，dynamic and physical properties and low temperature tensile strength of ethylene-vinyl acetate rubber（EVM）/hydrogenated nitrile-butadiene rubber(HNBR) blends prepared by melt blending were investigated.The results showed that EVM formed the continuous phase and HNBR was the dispersed phase when the blending ratio of EVM/HNBR was 70/30.HNBR could become continuous phase with the increase of HNBR mass fraction. The low-temperature resistance of EVM was improved with the addition of HNBR.When the blending ratio of EVM/HNBR was 70/30， the elongation at break at -40 ℃ was around 300%.Differential Scanning Calorimeter analysis also indicated that the glass transition temperature of the blends shifted toward low temperature with increasing HNBR mass fraction