Materials Science and Engineering, Center for Advanced Materials, Tuskegee University, Tuskegee, AL 36088, USA.
Nanotechnology. 2008 Jun 18;19(24):245703. doi: 10.1088/0957-4484/19/24/245703. Epub 2008 May 12.
Alignment of pristine carbon nanotubes (P-CNTs) and fluorinated carbon nanotubes (F-CNTs) in nylon-6 polymer composite fibers (PCFs) has been achieved using a single-screw extrusion method. CNTs have been used as filler reinforcements to enhance the mechanical and thermal properties of nylon-6 composite fibers. The composites were fabricated by dry mixing nylon-6 polymer powder with the CNTs as the first step, then followed by the melt extrusion process of fiber materials in a single-screw extruder. The extruded fibers were stretched to their maxima and stabilized using a godet set-up. Finally, fibers were wound on a Wayne filament winder machine and tested for their tensile and thermal properties. The tests have shown a remarkable change in mechanical and thermal properties of nylon-6 polymer fibers with the addition of 0.5 wt% F-CNTs and 1.0 wt% of P-CNTs. To draw a comparison between the improvements achieved, the same process has been repeated with neat nylon-6 polymer. As a result, tensile strength has been increased by 230% for PCFs made with 0.5% F-CNTs and 1% P-CNTs as additives. These fibers have been further characterized by DSC, Raman spectroscopy and SEM which confirm the alignment of CNTs and interfacial bonding to nylon-6 polymer matrix.
采用单螺杆挤出法实现了原始碳纳米管（P-CNTs）和氟化碳纳米管（F-CNTs）在尼龙-6 聚合物复合纤维（PCFs）中的排列。将 CNT 用作填充增强剂以提高尼龙-6 复合纤维的机械和热性能。首先通过干混法将尼龙-6 聚合物粉末与 CNT 混合，然后在单螺杆挤出机中进行纤维材料的熔融挤出工艺。将挤出的纤维拉伸至最大，并使用 godet 装置进行稳定。最后，将纤维缠绕在 Wayne 长丝卷绕机上，并测试其拉伸和热性能。测试表明，在添加 0.5wt% F-CNTs 和 1.0wt% P-CNTs 的情况下，尼龙-6 聚合物纤维的机械和热性能发生了显著变化。为了比较所取得的改进，对纯尼龙-6 聚合物重复了相同的过程。结果，添加 0.5% F-CNTs 和 1% P-CNTs 的 PCFs 的拉伸强度提高了 230%。这些纤维进一步通过 DSC、拉曼光谱和 SEM 进行了表征，这些方法证实了 CNT 的排列和与尼龙-6 聚合物基质的界面键合。
