茂金属聚乙烯/高流动性聚丙烯流变行为研究

Rheological Behavior of High-Fluid Polypropylene Modified With Metallocene Polyethylene

为改善高流动性聚丙烯(HF-PP)的性能,采用茂金属乙烯-己烯共聚物(mEHC)和茂金属乙烯-丁烯-己烯三元共聚物(mEBHC)进行改性,通过熔融共混法制得mEHC/HF-PP和mEBHC/HF-PP共混物。研究了mEHC和mEBHC对HF-PP熔体流动速率和流变行为的影响。结果表明,mEHC/HF-PP和mEBHC/HF-PP共混物的非牛顿指数小于1;随着共混物中mEHC和mEBHC含量的增加,共混物的熔体流动速率下降,表观黏度逐渐升高;mEHC/HF-PP和mEBHC/HF-PP比纯HF-PP具有更强的黏温敏感性。

To improve the property of high-fluid polypropylene（HF-PP）, HF-PP was modified with metallocene ethylene-hexene copolymer（mEHC） and metallocene ethylene- butene-hexene copolymer （mEBHC）, respectively, mEHC/HF-PP and mEBHC/HF-PP composites were prepared through mechanical blending and the effect of mEHC and mEBHC on melt flow rate and theological behavior of HF-PP. The results show that the non-newtonian index of mEHC/HF-PP and mEBHC/HF-PP composites are less than 1. With the content of mEHC and mEBHC increasing, the melt flow rate of the composites decreases and the apparent viscosity increases. Both of mEHC/HF-PP and mEBHC/HF-PP have a stronger sensitivity of viscosity on temperature than that of pure HF-PP.