Poly (lactic acid)/halloysite nanotube (PLA/HNT) nanocomposites have been studied extensively over the past few years owing to the interesting properties of the polymer, PLA, and the nanoclay, HNT, individually and as composites. In this paper, the influence of the screw speed during extrusion was investigated and was found to have a significant impact on the mechanical and thermal performance of the extruded PLA/HNT nanocomposites. To determine the effect of screw speed on PLA/HNT nanocomposites, 5 and 10 wt% of HNTs were blended into the PLA matrix through compounding at screw speeds of 40, 80, and 140 rpm. Virgin PLA was compounded for comparison. The resultant polymer melt was quench cooled onto a calendar system to produce composite films which were assessed for mechanical, thermal, chemical, and surface properties. Results illustrate that in comparison to 40 and 80 rpm, the virgin PLA when compounded at 140 rpm, indicated a significant increase in the mechanical properties. The PLA/HNT 5 wt% nanocomposite compounded at 140 rpm showed significant improvement in the dispersion of HNTs in the PLA matrix which in turn enhanced the mechanical and thermal properties. This can be attributed to the increased melt shear at higher screw speeds.

中文翻译：

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挤出螺杆转速对埃洛石纳米管浸渍聚乳酸纳米复合材料性能的影响

聚乳酸/埃洛石纳米管 (PLA/HNT) 纳米复合材料由于聚合物 PLA 和纳米粘土 HNT 单独和作为复合材料的有趣特性，在过去几年中得到了广泛的研究。在本文中，研究了挤出过程中螺杆速度的影响，发现对挤出的 PLA/HNT 纳米复合材料的机械和热性能有显着影响。为了确定螺杆速度对 PLA/HNT 纳米复合材料的影响，通过在 40、80 和 140 rpm 的螺杆速度下混合将 5 和 10 重量％的 HNT 混合到 PLA 基质中。为了比较，混合了纯 PLA。将所得聚合物熔体在压延系统上骤冷以生产复合膜，评估其机械、热、化学和表面性能。结果表明，与 40 和 80 rpm 相比，原始 PLA 在 140 rpm 下复合时，表明机械性能显着提高。PLA/HNT 5 wt% 纳米复合材料在 140 rpm 下复合显示出 HNT 在 PLA 基体中的分散性显着改善，进而增强了机械和热性能。这可归因于在较高螺杆速度下熔体剪切增加。