多壁奈米碳管/聚酯膠複合材料射出成形的結構控制

Abstract

近年來奈米複合材料技術發展迅速，而材料混摻奈米碳管能改善原材料物理性質之不足，本研究是利用電場及流場控制下，期望有效使奈米碳管產生配向，達到材料物性提升之目的。 研究中使用各種不同比例之PET/MWCNTs做為射出成形之材料，而在射出成形過程中，利用控制電場、模具溫度以及流場及電場作用時間等參數下進行實驗。研究結果發現：模具溫度越高以及電場強度越大，材料在充填過程中流動性越佳，故有較好之配向效果。而在射出成形過程中，同時使用流場及電場交互作用之下，亦有較佳之配向效果。在靠近澆口處，其導電性較為良好，但其硬度較低。本研究在射出成形過程中，有效利用電場作為外加能量場，誘發多壁奈米碳管配向，使得原材料之性質有效提升。

In recent years, the technology of nano-composite materials has been rapidly developed that blending carbon nanotubes into materials can compensate the physical property shortcomings of the original materials. In this study, under controlling electric and flow fields, making carbon nanotubes effectively generate alignment is expected to achieve the purpose of improving the physical property. This study used a variety of PET/MWCNTs with different ratios as the injection molding material. In the injection molding process, controlling parameters were used to implement the experiment, such as the electric field, mold temperature, the flow field, reaction time in the electric field and so on. The study results showed that: the higher mold temperature and the greater the electric field strength is, the better the fluidity of the materials in the filling process will be, so that the alignment effect is better. In the injection molding process, the alignment effect is better under the interaction between both the flow field and the electric field used simultaneously. The conductivity in the site near the gate is better but its hardness is lower. In this study, during the injection molding process, the electric field was effectively used as the external energy field to induce the alignment of the multi-walled carbon nanotubes, making the properties of the original materials promoted effectively.