POE改性PP的性能研究

Study on properties of PP modified with POE

采用动态黏弹谱,并辅以扫描电子显微镜、差示扫描量热仪,研究不同熔体流动速率和不同聚合方式的聚丙烯(PP)中加入乙烯-辛烯共聚物(POE)后,分子运动、微观结构和力学性能之间的关系。在POE添加量较低时,PP非晶内耗峰减弱,随着POE添加量的增加,tanδ2、tanδ3内耗峰变宽、增强。POE可显著提高均聚PP的常温抗冲击性能和共聚PP的低温抗冲击性能。POE在共聚PP中易与乙丙橡胶颗粒熔合缠结形成大颗粒,在均聚PP中易形成细小的颗粒。POE在与其黏度相近的PP中更易分散。

The relation between molecular movement, microstructure and mechanical properties of the polypropylene （PP） blended with elhylene-octeney copolymer （POE） was studied by means of dynamic viscoelastometer, scanning electron microscope and differential scanning calorimeter. The basic PP resins were prepared in different polymerization processes and possessed different melt flow rates. The amorphous loss peak was weakened when POE quantity was comparatively low; the loss peak tanδ2 and tanδ3 became wider and got more intensified with POE quantity. The addition of POE was able to raise notably the ambient temperature impact resistance of propylene homopelymer and the low temperature impact resistance of propylene copolymer. POE tended to be melted and stuck together with ethylene-propylene rubber to form larger particle in propylene copolymer and to form fine particle in propylene homopolymer. POE could be dispersed more easily in the PP matrix which had a similar viscosity.