乙烯-辛烯共聚物（POE）可以增韧无规共聚聚丙烯（PPR），但是POE种类和辛烯含量对PPR增韧效果具有明显影响。文章以3种不同辛烯含量的POE与PPR共混，通过PPR/POE共混物的DSC非等温结晶动力学分析揭示PPR和POE中的乙烯链段会形成共晶结构，导致结晶温度升高。通过熔体流动速率可知，辛烯含量高的POE会增大PPR/POE共混物的结晶温度，原因可能是高辛烯含量的POE流动性强，更容易分散在PPR/POE共混物中，因此对PPR起到更好的增韧效果。力学性能测试进一步证实了加入POE会使PPR强度略有降低，其中辛烯含量低的POE对强度影响较小。因此，在实际应用中需要综合考虑PPR在领域的应用，从而选择合适的POE。

Ethylene-octene copolymer (POE) can toughen polypropylene random (PPR). However, the type of POE and the octene concentration have a significant impact on the toughening effect of PPR. In this paper, three types of POE with different octene concentrations were blended with PPR. Through non-isothermal crystallization kinetics DSC analysis of PPR/POE blends, it was revealed that the ethylene segments in PPR and POE form a eutectic structure, leading to an increase in crystallization temperature. It can be inferred from the melt flow rate that POE with a high concentration of octene will increase the crystallization temperature of the PPR/POE blend. The reason may be that POE with a high octene concentration has strong fluidity and is more easily dispersed in the PPR/POE blend, thereby providing a better toughening effect on PPR. The mechanical property tests further confirm that the addition of POE can slightly reduce the strength of PPR, with POE containing lower octene concentration having a smaller impact on strength. Therefore, in practical applications, it is necessary to comprehensively consider the application of PPR in different directions and choose the appropriate POE.