作者：Wei Bao, Yunbao Gao, Jianing Zhang, Jing Jin, Baijun Liu, Mingyao Zhang, Xiangling Ji, Wei Jiang
关键字：PE, EPR, 核壳橡胶粒子, 聚丙烯, 熔融共混, 链结构
论文来源：期刊
具体来源：Journal of Applied Polymer Science, 2024, 141(46), e56245
发表时间：2024年

摘要：采用20种聚乙烯（PE），包括不同黏度的高密度聚乙烯（HDPE）和线性低密度聚乙烯（LLDPE），研究PE-乙烯丙烯橡胶（EPR）核壳橡胶粒子（CSRP）在聚丙烯（PP）基体中通过熔融共混原位形成。结果表明，当PE熔体流动指数（MFI）低于约0.3 g/10 min时，PE和EPR不能形成CSRP，PP/PE/EPR复合材料冲击断裂呈脆性；当PE MFI高于0.3 g/10 min时，PE和EPR可形成CSRP，导致PP/PE/EPR复合材料呈韧性冲击断裂。有趣的是，PP/PE/EPR复合材料中形成核壳结构所需的PE含量存在上限。该研究揭示了PE链结构和黏度对原位形成核壳橡胶粒子的影响。

Abstract：Twenty types of polyethylene (PE) including high density polyethylene (HDPE) and linear low-density polyethylene (LLDPE) with various viscosity were used to study the in-situ formation of PE-ethylene propylene rubber (EPR) core-shell rubber particles (CSRP) in polypropylene (PP) matrix by melt blending. The results show that PE and EPR cannot form CSRP if PE melt flow index (MFI) is lower than about 0.3 g/10 min. As a result, the impact fracture of PP/PE/EPR composite is brittle. If PE MFI is higher than 0.3 g/10 min, PE and EPR can form CSRP, leading to the ductile impact fracture of PP/PE/EPR composite. Interestingly, upper limit content of PE for the formation of core-shell structure in PP/PE/EPR composite was observed. This study reveals the effect of PE chain structure and viscosity on the in-situ formation of core-shell rubber particles.

论文链接：https://doi.org/10.1002/app.56245