
不同辛烯含量的POE对PPR结晶动力学和性能的影响
周芷伊, 邵文君, 史颖, 李先亮, 宋立新
不同辛烯含量的POE对PPR结晶动力学和性能的影响
Effect of POE with Different Octene Content on Crystallization Kinetics and Properties of PPR
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.
无规共聚聚丙烯 / 乙烯-辛烯共聚物 / 共混体系 / 增韧
Polypropylene random / Ethylene-octene copolymer / Blending system / Toughening
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