Processing Structure Property Relationship of TPU/Nd-Fe-B Composite Wire: Effect of Particle Filling Quantity on Material Extrusion Molding

Research Overview: A study published in Polymer Testing, Volume 163 (October 2026), by Yun Xu、Anja Winkler、Janez Slapnik、Julius Boettcher、Shengqiang Zhou、Maik Gude、Niels Modler Jointly completed, the theme is the processing structure performance relationship of TPU/Nd-Fe-B composite wire under different particle filling amounts, focusing on material extrusion molding technology. Research on the preparation of composite wires with different filling ratios using thermoplastic polyurethane (TPU) as the matrix and introducing Nd-Fe-B magnetic particles, and analyzing the correlation between processing, structure, and properties.

The correlation between processing structure performance

The core of this study is to reveal how the particle filling amount affects the structure of the wire material through the processing process, thereby determining the final performance.

. In material extrusion molding, the preparation quality of silk directly affects the stability of the printing process and the uniformity of the product. The change in filling amount will alter the flow behavior and particle dispersion state of the composite system, resulting in differences at the structural level and ultimately reflected in mechanical and functional properties. This chain like relationship has direct reference value for the formulation design of functional composite materials: the filling ratio is not only a means of adjusting magnetic properties, but also a key variable for processing window and structural uniformity.

Significance for the polymer additive industry

From the perspective of polymer aging and stabilization, this type of high filling functional composite material presents a topic worthy of attention.

. TPU may undergo thermal oxidative aging and photoaging during processing and service, and the introduction of high content inorganic particles can alter the thermal history, interface state, and oxygen diffusion pathway of the matrix, thereby affecting the evolution of degradation behavior. For processes involving multiple thermal processes such as material extrusion, ensuring processing stability is particularly crucial. A reasonable design of an antioxidant system can help suppress thermal degradation during extrusion and printing processes. At the same time, if the product is intended for outdoor or light environments, weather resistance and stability become an unavoidable part of formula design. The combination of HALS and UVA is a common solution. It is worth noting that the interaction between the surface of the filler and the additive may affect the migration and effectiveness of the additive. A single additive system is often difficult to meet the needs of both processing and application. Therefore, the collaborative design of complex systems is more practical.

Insights from Detection and Characterization

The systematic investigation of the relationship between processing structure performance also highlights the importance of characterization methods in the development of composite systems.

. The structural differences caused by changes in filling amount need to be identified through appropriate detection methods in order to establish a reliable correlation with performance. For polymer systems containing functional fillers, the performance comparison and structural characterization before and after aging are also the basis for evaluating the effectiveness of stabilization schemes. The ideas of this study can provide methodological references for formula screening and lifespan assessment in polymer aging research.

Conclusion

This study focuses on the processing structure performance relationship of TPU/Nd-Fe-B composite wire. Although it does not directly involve stabilizing agents, its analysis of the correlation between filling amount, processing conditions, and final performance provides a reference framework for the formulation optimization of functional polymer composite materials, and also highlights the importance of simultaneously considering processing stability and long-term weather resistance in high filling systems.

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Information source:Processing–structure–property relationships of TPU/Nd-Fe-B composite filaments with different particle loadings for material extrusion， Organized by Herun Chemical.