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Controlled length and number of thermal conduction pathways for copper wire/poly(lactic acid) composites via 3D printing

3D打印调控铜线/聚乳酸复合材料的导热通路长度和数量

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Abstract

Thermal conduction pathways play crucial roles in comprehending thermal transport in thermally conductive polymer composites. However, there is a lack of in-depth investigation on how the thermal conduction pathways (length and number) influence the thermal conductivity coefficients (λ) of the composites. In this work, three-dimensional (3D) printing is performed to fabricate the thermally conductive 1D copper wire/poly(lactic acid) (1D-Cw/PLA) composites, allowing for controlling the length and number of Cw thermal conduction pathways. And one thermal conduction model is also proposed and established for polymer composites with 1D thermal conduction pathways, elucidating the quantitative relationship between thermal conduction pathways and thermal conductivity. For composites with the same amount of Cw, the in-plane λ (λ//) of thermally conductive 1D-Cw/PLA composites is positively correlated with the number and length of Cw thermal conduction pathways. Specifically, when the volume fraction of Cw is 25.1 vol%, the λ// of 1D-Cw/PLA composites, containing 20 intact Cw thermal conduction pathways, can reach up to 4.23 W m−1 K−1, which is 87.2% higher than that of 1D-Cw/PLA composites without intact Cw thermal conduction pathways (2.26 W m−1 K−1), 72.0% higher than that of 1D-Cw/PLA composites with short Cw (2 intact Cw and 18 Cw broken at the half, 2.46 W m−1 K−1), and 1527% higher than that of the pure PLA matrix (0.26 W m−1 K−1). Furthermore, the predicted λ values from our established thermal conduction model and empirical equation show no significant difference from the measured λ at a 95% confidence level.

摘要

导热通路对理解导热高分子复合材料的导热行为至关重要, 但目前有关导热通路属性(长度、 数量)对高分子复合材料导热系数的影响机制缺乏深入研究. 本文采用3D打印技术制备了铜线(Cw)导热通路长度和数量可控的一维铜线/聚乳酸(1D-Cw/PLA)导热复合材料, 建立了针对一维导热通路的高分子复合材料的导热模型, 明晰了其导热通路属性与其导热性能的定量关系. 相同Cw用量下, 1D-Cw/PLA导热复合材料的面内导热系数与导热通路的数量和长度呈正相关. 采用本文构建的导热模型和经验方程对1D-Cw/PLA复合材料的导热系数进行预测, 95%的置信度表明预测值与实测值无显著差异.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51973173), the Technological Base Scientific Research Projects (Highly Thermal conductivity Nonmetal Materials), and the Fundamental Research Funds for the Central Universities. Ruan K would like to thank the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (CX2022073). This work was also financially supported by the Polymer Electromagnetic Functional Materials Innovation Team of Shaanxi Sanqin Scholars.

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Contributions

Author contributions Gu J and Ma T designed the samples; Ma T and Guo Y performed the experiments; Ma T, Ruan K and Han Y performed the data analysis; Ma T and Ruan K wrote the paper with support from Gu J. All authors contributed to the general discussion.

Corresponding authors

Correspondence to Yongqiang Guo  (郭永强) or Junwei Gu  (顾军渭).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Tengbo Ma obtained his Bachelor degree from Northwestern Polytechnical University in 2016. Currently he is a PhD candidate majoring in materials science at Northwestern Polytechnical University. His research interests include structural optimization, performance improvement, and mechanism research of thermally conductive polymer composites.

Kunpeng Ruan obtained his Bachelor degree from Northwestern Polytechnical University in 2019. Currently he is a PhD candidate majoring in materials science at Northwestern Polytechnical University. His research interests include structural optimization, performance improvement and mechanism investigation of intrinsically thermally conductive polyimide and its composite films.

Yongqiang Guo obtained his PhD degree from Northwestern Polytechnical University in 2022. Currently he is a postdoc at Beihang University. His research interests focus on structural optimization, performance improvement and mechanism investigation of thermally conductive polymer composites.

Junwei Gu received his PhD degree from Northwestern Polytechnical University, China in 2010. He is a professor at the School of Chemistry and Chemical Engineering, Northwestern Polytechnical University. His research interests include thermally conductive polymers and composites, fiber-reinforced polymer matrix wave-transparent composites, and electromagnetic interference shielding polymer matrix composites.

Supplementary information Supporting data are available in the online version of the paper.

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40843_2023_2540_MOESM1_ESM.pdf

Controlled length and number of thermal conduction pathways for copper wire/poly(lactic acid) composites via 3D printing

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Ma, T., Ruan, K., Guo, Y. et al. Controlled length and number of thermal conduction pathways for copper wire/poly(lactic acid) composites via 3D printing. Sci. China Mater. 66, 4012–4021 (2023). https://doi.org/10.1007/s40843-023-2540-9

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