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

为了扩展与熔丝制造（FFF）有关的商业材料的多样性，考虑了拉伸和冲击强度，并针对较少研究的（共）聚酯类，研究了喷嘴温度和层厚度与最终产品机械性能的关系。显微成像。结果表明，在有限的聚合物降解的情况下，可以通过调整层间焊接的作用来集中精力增加层高（从0.1毫米增加到0.3毫米），而在明显降解的情况下，则需要较低的层高（0.1毫米）利用层内焊接的贡献，对于更高的喷嘴温度（例如260°C）是有利的。通过熔体流动指数和流变学分析研究降解的相关性。