Design and fabrication of dual-material honeycomb structures with enhanced magneto-responsive shape memory effect by 4D printing

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-07-26 DOI:10.1016/j.coco.2025.102547

Yi Fang , Zhaoyuan Wang , Han Liu , Lin Sang , Haidong Liang

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Abstract

Four-dimensional (4D) printing of magneto-responsive shape memory structures has triggered significant research enthusiasm in bone tissue engineering applications due to the possibility for minimally invasive surgery. Herein, magneto-responsive polylactic acid/thermoplastic polyurethane/Fe₃O₄ (P/T/F) composites with fillers were firstly developed. By adding thermal conductive fillers, the thermal conductivity was greatly improved and the shape recovery time shortened from 50 s to 38 s under external magnetic field. Subsequently, dual-material honeycomb structure using P/T and P/T/F/boron nitride (BN) fillers were designed and 4D-printed. A cold-programmed shape fixing under compression force and magneto-recovery cycle was established. Microstructural observation showed that alternative deposition based on the same polymeric matrix obtained a good interfacial adhesion. More importantly, the dual-material honeycomb achieved good shape recovery effect and comparable mechanical performance. The P/T/F/BN(4)-P/T(2) honeycomb completed the magnetic shape recovery time in 70 s with a shape recovery ratio above 93 %, while pure P/T honeycomb was unable to conduct shape response under magnetic field. Lastly, an interlocking design between dual-material layers was proposed to further accelerate the shape recovery process within 55 s, which indicated an effective strategy. Above all, the current research has highly attractive feature to design and fabricate intelligent composites for biomedical applications.

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增强磁响应形状记忆效应的双材料蜂窝结构的4D打印设计与制造

由于微创手术的可能性，磁响应形状记忆结构的四维（4D）打印在骨组织工程应用中引发了极大的研究热情。在此基础上，首次研制了带填料的磁响应型聚乳酸/热塑性聚氨酯/Fe3O4 （P/T/F）复合材料。在外加磁场作用下，加入导热填料可大大提高材料的导热性，使材料的形状恢复时间由50 s缩短至38 s。随后，设计了P/T和P/T/F/氮化硼（BN）填料的双材料蜂窝结构并进行了3d打印。建立了在压缩力和磁恢复循环作用下的冷编程固形方法。显微结构观察表明，基于相同聚合物基体的替代沉积获得了良好的界面粘附性。更重要的是，双材料蜂窝取得了良好的形状恢复效果和相当的力学性能。P/T/F/BN(4)-P/T(2)蜂窝在70 s内完成磁性形状恢复，形状恢复率在93%以上，而纯P/T蜂窝在磁场下无法进行形状响应。最后，提出了双材料层之间的互锁设计，进一步加速了55 s内的形状恢复过程，这是一种有效的策略。综上所述，目前的研究对设计和制造生物医学应用的智能复合材料具有很高的吸引力。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.