乙丙嵌段共聚物改性PP/EPR共混物

Ethylene-Propylene Block Copolymer Modified PP/EPR Blends

以乙丙嵌段共聚物(EP)作为增容剂,采用熔融共混的方法制备了聚丙烯(PP)/二元乙丙橡胶(EPR)共混物,通过冲击试验机、电子万能试验机、动态力学分析仪、扫描电子显微镜、偏光显微镜、差示扫描量热仪、平板流变仪、熔体流动速率仪等,研究了EP添加量对PP/EPR共混物力学性能、分散相聚集态结构及加工性能的影响。结果表明,EP对PP/EPR共混物具有良好的增容作用,降低了PP相的熔点和结晶规整性,提高了PP相的结晶温度和结晶度,当EP质量分数为8%时,分散相EPR粒子直径最小、PP和EPR相容性最好,此时共混物的缺口冲击强度和断裂伸长率达到最大值,加工性能最好。

Polypropylene(PP)/ethylene-propylene rubber(EPR)blends was prepared using melt blending with ethylenepropylene block copolymer(EP)as compatibilizer.The effects of the amount of EP added on mechanical properties,dispersed phase aggregation structure and processability of PP/EPR blends were studied by impact tester,electronic universal tester,dynamic mechanical analyzer,scanning electron microscope,polarizing microscope,differential scanning calorimeter,parallel plate rheometer and melt flow rate meter.The results show that the addition of EP has a good compatibilizing effect on PP/EPR blends,reduces the melting point and crystallization regularity of PP phase,and improves the crystallization temperature and crystallinity of PP phase.When the EP mass fraction is 8%,the particle diameter of dispersed phase EPR is the smallest and the compatibility of PP and EPR is the best.Meanwhile,the notched impact strength and elongation at break of the blends simply supported beam reach the maximum,the processability is the best.