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首页> 外文期刊>Journal of Applied Polymer Science >Effects of process conditions and mixing protocols on structure of extruded polypropylene nanocomposites
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Effects of process conditions and mixing protocols on structure of extruded polypropylene nanocomposites

机译：工艺条件和混合方案对挤出聚丙烯纳米复合材料结构的影响

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Polymer melt-direct intercalation or exfoliation is a promising approach for the preparation of nanocomposites. The structure of nanoclay platelets in the nanocomposites depends not only on the properties of polymer matrix and nanoclay, but also on the operating conditions during processing. The objective of the present work is to investigate the effects of clay chemical modifiers, mixing protocols, and operating conditions upon the clay structure in nanocomposites prepared with a corotating twin-screw extruder. Two mixing methods were used for the nanocomposite preparation: two-step mixing and one-step mixing. Experimental results obtained from melt flow index and complex viscosity measurements suggest that nanoclay C15A is more exfoliated than C30B in a polypropylene homopolymer containing a maleic anhydride grafted PP (PB) as compatibilizer. The two-step mixing method results in better exfoliation for the nanofillers than the one-step mixing method. A numerical simulation has been carried out to evaluate the mean residence time and shear rate in different screw configurations under various process conditions. Xray diffraction experiments indicate that the residence time is a dominant factor in producing satisfactory nanocomposites in extruders. However, high shear rate coupled with long residence time might result in poor exfoliation of clay. (C) 2004 Wiley Periodicals, Inc.
机译：聚合物直接熔体嵌入或剥离是制备纳米复合材料的一种有前途的方法。纳米复合物中纳米粘土薄片的结构不仅取决于聚合物基质和纳米粘土的性质，而且取决于加工过程中的操作条件。本工作的目的是研究用同向旋转双螺杆挤出机制备的纳米复合材料中粘土化学改性剂，混合方案和操作条件对粘土结构的影响。两种复合方法用于纳米复合材料的制备：两步混合和一步混合。从熔体流动指数和复数粘度测量获得的实验结果表明，在含有顺丁烯二酸酐接枝的聚丙烯（PB）作为增容剂的聚丙烯均聚物中，纳米粘土C15A的剥落比C30B的剥落更多。与一步混合方法相比，两步混合方法对纳米填料的剥离效果更好。进行了数值模拟，以评估在各种工艺条件下不同螺杆配置下的平均停留时间和剪切速率。 X射线衍射实验表明，停留时间是在挤出机中生产令人满意的纳米复合材料的主要因素。但是，高剪切速率和较长的停留时间可能导致粘土的剥离不良。 （C）2004年Wiley Periodicals，Inc.

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