writer：Wei Bao, Yunbao Gao, Fushi Li, Jianing Zhang, Jing Jin, Baijun Liu, Nan Yan, Mingyao Zhang, Wei Jiang
keywords：核壳粒子, 聚丙烯, 增韧, 核力学性能, 冲击韧性
source：期刊
specific source：Journal of Polymer Research, 2023, 30(7), 282
Issue time：2023年

摘要：核壳粒子已广泛用于增韧热塑性聚合物，其中核由聚丙烯（PP）、聚乙烯（PE）、聚苯乙烯（PS）等不同热塑性聚合物组成，壳由橡胶或弹性体组成。然而，核力学性能如何影响核壳粒子增韧聚合物的韧性至今尚不清楚。本文采用五种聚乙烯（PE）原位制备PE-乙烯丙烯橡胶（EPR）核壳粒子增韧聚丙烯（PP）复合材料。结果表明，PE核在韧性断裂过程中可发生屈服，PE屈服应力越高，冲击韧性越高。当PP基体中PE和PE-EPR核壳粒子含量固定为20 wt%时，随着PE屈服应力从10.0 MPa增加到28.5 MPa，缺口冲击强度从39.2 kJ/m2提高到56.7 kJ/m2。此外，由于PP的屈服应力高于PE，PP-EPR核壳粒子增韧PP复合材料的缺口冲击强度明显高于埃克森美孚化工生产的PE-EPR核壳粒子增韧PP复合材料。

Abstract：Core-shell particles have been extensively used to toughen thermal plastic polymers, in which the core is composed of different thermal plastic polymers such as polypropylene (PP), polyethylene (PE), polystyrene (PS), et al, whereas the shell is composed of rubber or elastomer. However, how the core mechanical properties affect the toughness of core-shell particles toughened polymers has remained unclear up to now. In this article, five kinds of polyethylene (PE) were used to in situ prepare PE-ethylene propylene rubber (EPR) core-shell particles toughened polypropylene (PP) composites. The results show that the PE cores can be yielded during ductile fracture, and the higher the yield stress of PE, the higher the impact toughness is. The notch impact strength increases from 39.2 to 56.7 kJ/m2 with increasing PE yield stress from 10.0 to 28.5 MPa for the composites when the content of PE and PE-EPR core-shell particles in the PP matrix is fixed at 20 wt%. Moreover, it can be well interpreted that the notch impact strength of PP-EPR core-shell particles toughened PP composites is obviously higher than that of PE-EPR core-shell particles toughened PP composites produced by ExxonMobil Chemical Co. because the yielding stress of PP is higher than that of PE.

论文链接：https://doi.org/10.1007/s10965-023-03668-9