Eco-sustainable magnetic polymer composites using recycled and rare-earth-free hard magnetic fillers†

IF 4.9

RSC sustainability Pub Date : 2025-07-15 DOI:10.1039/D5SU00222B

Ayda Ghary Haghighat, Eider Matxinandiarena, Manuela Zubitur, Agurtzane Mugica, Fulvio Bellato, Anna M. Ferretti, Alessandro Ponti, Souad Ammar, Maryam Abdolrahimi, Gaspare Varvaro, Pierfrancesco Maltoni, Dario Cavallo, Alexander Omelyanchik, Alejandro J. Müller and Davide Peddis

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Abstract

Biodegradable polymer matrices, poly(ε-caprolactone) (PCL), and poly(butylene succinate-ran-butylene adipate) (PBSA) were used to fabricate magnetic composites with recycled NdFeB and rare earth-free lab-synthesized ferrite fillers (SrFe₁₂O₁₉ and SrFe₁₂O₁₉–CoFe₂O₄) across a wide filling range (1–90%). Results obtained by differential scanning calorimetry, polarized light optical microscopy, and phase contrast microscopy, indicated that the magnetic particles tend to aggregate, leading to bimodality in the crystallization process, which can be attributed to distinct regions of the composites with well-dispersed and aggregated particles. Notably, ferrite fillers exhibited lower magnetic anisotropy compared to NdFeB, enabling magnetic saturation at lower fields. These results demonstrate the potential of combining biodegradable polymers with sustainable magnetic fillers for eco-friendly circular economy applications.

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生态可持续磁性聚合物复合材料使用回收和不含稀土的硬磁性填料†

采用可生物降解聚合物基质、聚ε-己内酯（PCL）和聚丁二酸丁二烯-己二酸丁二烯)（PBSA）制备磁性复合材料，采用再生钕铁硼和实验室合成的无稀土铁氧体填料（SrFe12O19和SrFe12O19 - cofe2o4），填充范围为1-90%。差示扫描量热法、偏振光光学显微镜和相对比显微镜的结果表明，磁性颗粒倾向于聚集，导致结晶过程中出现双峰态，这可以归因于复合材料中颗粒分散和聚集良好的不同区域。值得注意的是，与钕铁硼相比，铁氧体填料表现出更低的磁各向异性，在较低的磁场下实现磁饱和。这些结果表明，将可生物降解聚合物与可持续磁性填料结合起来，在生态友好的循环经济应用中具有潜力。

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RSC sustainability

CiteScore

0.60

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0.00%

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