In situ formation of core‐shell rubber particles in polypropylene matrix by melt blending and its effects on the toughness and stiffness of the composites
In situ formation of core‐shell rubber particles in polypropylene matrix by melt blending and its effects on the toughness and stiffness of the composites
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熔融共混在聚丙烯基体中原位形成核壳橡胶颗粒及其对复合材料韧性和刚度的影响
DOI：
10.1002/pen.26169
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发表时间：
2022-10
期刊：
影响因子：
--
通讯作者：
Wei Jiang
中科院分区：
文献类型：
--
作者：
Fushi Li;Na Zhang;Yunbao Gao;Nan Yan;Jing Jin;Zhaohui Su;Wei Jiang
用单相冲击改性剂增韧热塑性塑料通常会导致刚度显著降低，而核壳橡胶改性剂具有额外的结构参数，如核刚度和壳柔性，通过控制这些参数，可以更好地平衡其复合材料的刚度和冲击韧性。本研究以三种不同刚性的聚乙烯（PE）为原料，采用熔融共混法制备了聚丙烯/乙丙橡胶/聚乙烯（PP/EPR/PE）三元复合材料，其中EPR：PE = 1：1。原子力显微镜-红外（AFM-IR）和扫描电子显微镜（SEM）的结果表明，具有PE核和EPR壳的核-壳橡胶粒子原位形成并均匀分散在PP基体中。力学性能测试表明，在相同改性剂含量下，核壳橡胶粒子增韧PP复合材料的韧性和刚度均高于EPR，且PE核越硬，增韧效果越好。这些结果与最近的理论模型定量一致，为后者提供了坚实的实验证据。此外，这项工作证明了一种经济的方法，增韧PP的部分替代EPR与更便宜的PE更好的性能。
Toughening of thermoplastics with a one‐phase impact modifier generally results in significant reduction in stiffness, whereas core‐shell rubber modifiers have extra structural parameters such as core rigidity and shell flexibility, by controlling which the stiffness and impact toughness of their composites can be better balanced. In this study, three kinds of polyethylene (PE) with different rigidity are used respectively to prepare polypropylene/ethylene–propylene rubber/polyethylene (PP/EPR/PE) ternary composites by melt blending, in which the EPR‐to‐PE ratio is 1:1. Atomic force microscopy‐infrared (AFM−IR) and scanning electron microscopy (SEM) results indicate that core‐shell rubber particles with a PE core and an EPR shell are formed in situ and uniformly dispersed in the PP matrix. Mechanical measurements show that at the same modifier content the PP composites toughened with these core‐shell rubber particles exhibit higher toughness and stiffness than that with EPR alone, and the more rigid the PE core, the greater the effects. These results are in quantitative agreement with a recent theoretical model, providing solid experimental evidence in support of the latter. Furthermore, this work demonstrates an economical approach to toughening PP by partial substitution of the EPR with the much cheaper PE for better performance.
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