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Polyethylene nanofibres with very high thermal conductivities
Sheng Shen1, Asegun Henry, Jonathan Tong
1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Nature Nanotechnology
|March 9, 2010
Summary
Researchers developed ultra-drawn polyethylene nanofibres with exceptional thermal conductivity. These advanced polymer materials exhibit heat transfer properties surpassing many metals, offering new possibilities for thermal management applications.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Bulk polymers typically function as thermal insulators with low thermal conductivity (around 0.1 W m⁻¹ K⁻¹).
- Recent studies indicate that individual polymer chains, like polyethylene, can possess significantly higher thermal conductivity.
Purpose of the Study:
- To fabricate high-quality polyethylene nanofibres for practical applications.
- To investigate the thermal conductivity of these engineered polymer nanostructures.
Main Methods:
- Fabrication of ultra-drawn polyethylene nanofibres with controlled diameters (50-500 nm) and lengths (up to tens of millimeters).
- Measurement of the thermal conductivity of the resulting nanofibres.
Main Results:
- Achieved ultra-drawn polyethylene nanofibres with thermal conductivity as high as approximately 104 W m⁻¹ K⁻¹.
- This conductivity is notably higher than that of about half of all pure metals.
- High thermal conductivity is linked to polymer chain restructuring and improved crystalline fibre quality through stretching.
Conclusions:
- Ultra-drawn polyethylene nanofibres demonstrate exceptionally high thermal conductivity, challenging the conventional view of polymers as insulators.
- These findings suggest potential applications for polymers as efficient heat spreaders, complementing traditional metallic materials.
- The development paves the way for novel heat-transfer solutions in electronics, solar energy, and heat exchangers.
