2025-04-17 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/phys/202504/t20250418_1041521.shtml
- https://www.sciencedirect.com/science/article/abs/pii/S1385894725032255
- https://www.sciencedirect.com/science/article/abs/pii/S0008622325000399
レーザー誘起3D印刷グラフェン強化熱可塑性ポリウレタン構造による異方性と光・電熱除氷性能の向上 Laser induced 3D printed graphene enhanced thermoplastic polyurethane structure for improved anisotropy and Photo-/Electro-thermal deicing performance
Zihao Kang, Min Xi, Nian Li, Zhenyang Wang
Chemical Engineering Journal Available online: 7 April 2025
DOI:https://doi.org/10.1016/j.cej.2025.162399
Graphical abstract
A previously developed FDM 3D-printed graphene enhanced thermoplastic polyurethanes double-layer structure (G-TPU/N-TPU) was treated with laser induction, that led to remarkable improvements in anisotropic thermal and electrical conductivity properties, surface hydrophobicity, photothermal and electrothermal performance, as the results of reserved orientation of graphene flakes and the integrity of double-layer structure.
Highlights
- LI-G-TPU/N-TPU double-layer was fabricated via FDM printing and laser induction.
- The developed structure had exceptional anisotropic thermal conductivity of 9.1.
- A remarkable anisotropic thermal conductivity of 2.47 × 107 was discovered.
- Surface hydrophobicity transform from contact angle 116° to 88° was realized.
- Excellent photothermal and electrothermal deicing performances were validated.
Abstract
A laser induction process was applied to a previously developed FDM 3D-printed graphene enhanced thermoplastic polyurethane structure. Notably, the orientation of graphene flakes and the integrity of the double-layer structure were preserved during the decomposition of the polymer matrix, resulting in anisotropic electrical conductivity (RTP/RIP of 2.47 × 107) and thermal conductivity (TCIP/TCTP of 9.1). The laser treatment removed the polymer matrix and generated porous graphene flake micro/nanostructures on the surface led to significant improvement in surface hydrophobicity. Despite the defects introduced by the process, most of the mechanical properties were retained, with over 63.3 % of tensile strength and 72.2 % of elastic modulus preserved. A noticeable increase in the coefficient of friction (COF) of graphene enhanced TPU was observed, which was attributed to the synergistic effects of the low COF of the porous graphene flake layer and the high COF of the polymer residue. The excellent heat retention of the structure, ensured by the low thermal conductivity in the TP direction and the enhanced photothermal effect, was systematically evaluated. The photothermal de-icing performance demonstrated a nearly 20 % reduction in ice melting time and electrothermal de-icing performance proved an effective and safe operation voltage of 20 V, confirming its efficacy in practical applications.
光熱変換に向けた3Dプリントグラフェン強化熱可塑性ポリウレタン構造の異方的熱伝導性 Anisotropic thermal conductivity of 3D printed graphene enhanced thermoplastic polyurethanes structure toward photothermal conversion
Zihao Kang, Min Xi, Nian Li, Shudong Zhang, Zhenyang Wang
Carbon Available online: 23 January 2025
DOI:https://doi.org/10.1016/j.carbon.2025.120023
Graphical abstract
A G-TPU/N-TPU double-layer with high anisotropic thermal conductivity was realized via dual-nozzles FDM printing technique that was promising for photothermal deicing and IR imaging performances.
Highlights
- A G-TPU/N-TPU double-layer was realized via dual-nozzles FDM printing technique.
- The developed structure had exceptional anisotropic thermal conductivity of ∼8.
- Excellent photothermal de-icing and IR labeling performances were validated.
- Improved mechanical properties in impact resistance and wear resistance were studied.
Abstract
Solar photothermal conversion is one of the most straightforward methods to utilize solar energy. In this manuscript, a novel double-layer structure constructed of graphene enhanced thermoplastic polyurethanes (G-TPU) and neat thermoplastic polyurethanes (N-TPU) was developed via fused deposition modelling (FDM) 3D printing process. The developed G-TPU/N-TPU double-layer structure exhibited anisotropic thermal conductivity that simultaneously satisfied high in-plane (IP) thermal conductivity and low through-plane (TP) thermal conductivity. The top G-TPU layer essentially offered a high IP thermal conductivity of 4.54 W/(m·K) due to formed thermal conduction network of graphene flakes that lead to overall structure’s anisotropic thermal conductivity ratio (TCIP/TCTP) of ∼8. And the low thermal conductivity in the TP direction led to the heat retention effects for thermal storage. Nonetheless, the exceptional photothermal conversion effect of graphene flakes guaranteed the superior photothermal performance that was promising in the photothermal deicing and infrared imaging applications. Finally, the graphene flake’s enhancement in the mechanical properties of the G-TPU/N-TPU double layer structure was also evaluated that contributed to excellent impact resistance with a puncture energy reaching 10.86 J, and extraordinary wear resistance with a small friction coefficient of 0.1 over 1000 cycles, which ensured the structure suitable for applications at harsh environment.
