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首页> 外文期刊>Journal of Applied Polymer Science >Role of nanoclay distribution on morphology and mechanical behavior of rubber-modified polyolefins
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Role of nanoclay distribution on morphology and mechanical behavior of rubber-modified polyolefins

机译：纳米粘土分布对橡胶改性聚烯烃的形态和力学行为的影响

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Polyolefin blends have attracted great attention for years because of their improved physical and mechanical properties; especially when microanofillers are present in the compound. Previous investigations have proven that incorporation of small amounts of nanoclay can enhance physical and mechanical properties of the polymer. This research has focused on the role of clay distribution on morphology and mechanical properties of ternary nanocomposites containing a rubbery phase. High-density polyethylene/ethylene vinyl acetate/clay (HDPE/EVA/clay) is opted as a typical model for this purpose. EVA is selected to act as both compatibilizer, because of having polar vinyl groups, and rubber-modifier, because of its elastomeric properties, in this ternary blend. Nanocomposite preparation was performed via one- and two-step mixing routes to achieve two different desired morphologies. Tensile and Izod impact tests, and different microscopic techniques, were used to evaluate nanostructure and mechanical performance of blends. Results of the study proved two distinct morphologies forming as a result of different incorporated processing techniques. Mixing components simultaneously leaded to a structure in which, clay platelets are located at the HDPE/EVA interface, whereas in the two-step processing route, most of the clay platelets are encapsulated by the EVA second phase particles. According to the results of the current study, encapsulation of the nanofillers by the second rubbery phase harms mechanical properties of the blend and should be avoided. On the other hand, much better mechanical performance is obtained when the clay platelets are located at the matrix/rubber interface. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41993.
机译：聚烯烃共混物由于其改善的物理和机械性能而受到了多年的关注。特别是当化合物中存在微纳诺菲尔时。先前的研究已经证明，掺入少量的纳米粘土可以增强聚合物的物理和机械性能。这项研究集中于粘土分布对含有橡胶相的三元纳米复合材料的形态和力学性能的作用。为此选择了高密度聚乙烯/乙烯乙酸乙烯酯/粘土（HDPE / EVA /粘土）作为典型模型。在这种三元共混物中，由于具有极性乙烯基，因此选择EVA作为增容剂，并且由于其弹性性能而选择橡胶改性剂。纳米复合材料的制备是通过一步和两步的混合途径完成的，以实现两种不同的所需形态。拉伸和悬臂梁式冲击试验以及不同的显微技术被用于评估共混物的纳米结构和机械性能。研究结果证明，由于采用了不同的加工技术，形成了两种不同的形态。混合组分同时导致一种结构，在该结构中，粘土薄片位于HDPE / EVA界面，而在两步加工路线中，大多数粘土薄片被EVA第二相颗粒包裹。根据当前研究的结果，第二橡胶相对纳米填料的封装会损害共混物的机械性能，应避免使用。另一方面，当粘土薄片位于基体/橡胶界面处时，可获得更好的机械性能。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41993。

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