ABSTRACT

To extend the diversity of commercial materials relevant for fused filament fabrication (FFF), the relation of nozzle temperature and layer thickness with respect to final product mechanical performance is examined for the less studied group of (co)polyesters, considering tensile and impact strength and microscopic imaging. It is demonstrated that with limited polymer degradation, one can focus on increasing the layer height (from 0.1 to 0.3 mm) by tuning of the contribution of inter-layer welding, whereas with significant degradation, a lower layer height (0.1 mm) is needed to exploit the contribution of intra-layer welding for which a higher nozzle temperature (e.g. 260°C) is beneficial. The relevance of degradation is studied by both melt flow index and rheological analysis. The study ultimately provides the best FFF parameters for three commercial copolyesters and highlights the competition of inter- and intra-welding as a key microscopic material design strategy.

摘要

为了扩展与熔融长丝制造 (FFF) 相关的商业材料的多样性，研究了较少研究的（共）聚酯组的喷嘴温度和层厚度与最终产品机械性能的关系，同时考虑了拉伸和冲击强度以及显微成像。结果表明，在聚合物降解有限的情况下，可以通过调整层间焊接的贡献来专注于增加层高（从 0.1 到 0.3 毫米），而在显着降解的情况下，需要较低的层高（0.1 毫米）利用较高的喷嘴温度（例如 260°C）有利于层内焊接的贡献。通过熔体流动指数和流变分析研究降解的相关性。