| Autor: |
Hartquist, Chase M., Li, Buxuan, Zhang, James H., Yu, Zhaohan, Lv, Guangxin, Shin, Jungwoo, Boriskina, Svetlana V., Chen, Gang, Zhao, Xuanhe, Lin, Shaoting |
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| Zdroj: |
Nature Communications; 7/3/2024, Vol. 15 Issue 1, p1-12, 12p |
| Abstrakt: |
Polymeric thermal switches that can reversibly tune and significantly enhance their thermal conductivities are desirable for diverse applications in electronics, aerospace, automotives, and medicine; however, they are rarely achieved. Here, we report a polymer-based thermal switch consisting of an end-linked star-shaped thermoset with two independent thermal conductivity tuning mechanisms—strain and temperature modulation—that rapidly, reversibly, and cyclically modulate thermal conductivity. The end-linked star-shaped thermoset exhibits a strain-modulated thermal conductivity enhancement up to 11.5 at a fixed temperature of 60 °C (increasing from 0.15 to 2.1 W m−1 K−1). Additionally, it demonstrates a temperature-modulated thermal conductivity tuning ratio up to 2.3 at a fixed stretch of 2.5 (increasing from 0.17 to 0.39 W m−1 K−1). When combined, these two effects collectively enable the end-linked star-shaped thermoset to achieve a thermal conductivity tuning ratio up to 14.2. Moreover, the end-linked star-shaped thermoset demonstrates reversible tuning for over 1000 cycles. The reversible two-way tuning of thermal conductivity is attributed to the synergy of aligned amorphous chains, oriented crystalline domains, and increased crystallinity by elastically deforming the end-linked star-shaped thermoset. The need for reversible yet sizable thermal conductivity tuning in bulk materials impedes practical thermal switch design. Here, the authors report a scalable polymer which achieves a reversible 14 × tuning ratio via strain and temperature modulation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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