In situ formation of PE-EPR core-shell rubber particles in polypropylene matrix by melt blending: Effect of PE chain structure and viscosity

IF 2.7 3区 化学 Q2 POLYMER SCIENCE
Wei Bao, Yunbao Gao, Jianing Zhang, Jing Jin, Baijun Liu, Mingyao Zhang, Xiangling Ji, Wei Jiang
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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 CSRP depends on the type and viscosity of PE. For HDPE, upper limit content of PE tends to increase with the increase of its MFI, whereas it drops considerably for LLDPE. Understanding these relationships provides insights into optimizing the selection of core types and viscosity for enhancing the mechanical properties of polymer composites with core-shell structure. This may potentially guide the development of cost-effective and high-performance polymer composites.

Abstract Image

通过熔融混合在聚丙烯基体中原位形成 PE-EPR 芯壳橡胶颗粒:聚乙烯链结构和粘度的影响
采用 20 种不同粘度的聚乙烯(PE),包括高密度聚乙烯(HDPE)和线型低密度聚乙烯(LLDPE),研究了聚乙烯-乙丙橡胶(EPR)在聚丙烯(PP)基体中通过熔融共混原位形成芯壳橡胶颗粒(CSRP)的情况。结果表明,如果聚乙烯熔体流动指数(MFI)低于约 0.3 克/10 分钟,聚乙烯和乙丙橡胶就不能形成 CSRP。因此,PP/PE/EPR 复合材料的冲击断裂是脆性的。如果 PE 熔体流动指数(MFI)高于 0.3 克/10 分钟,PE 和 EPR 就会形成 CSRP,从而导致 PP/PE/EPR 复合材料发生韧性冲击断裂。有趣的是,形成 CSRP 的 PE 上限含量取决于 PE 的类型和粘度。对于高密度聚乙烯,聚乙烯的上限含量往往会随着其 MFI 的增加而增加,而对于低密度聚乙烯,上限含量则会大幅下降。了解这些关系有助于优化芯材类型和粘度的选择,从而提高具有芯壳结构的聚合物复合材料的机械性能。这有可能为开发具有成本效益和高性能的聚合物复合材料提供指导。
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来源期刊
Journal of Applied Polymer Science
Journal of Applied Polymer Science 化学-高分子科学
CiteScore
5.70
自引率
10.00%
发文量
1280
审稿时长
2.7 months
期刊介绍: The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.
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