Thermal Conductivity of Single-Walled Carbon Nanotube/PMMA Nanocomposites

Journal of Heat Transfer - Tập 129 Số 8 - Trang 1096-1099 - 2007
Csaba Guthy1, Fangming Du2, Stijn Brand1, Karen I. Winey2,3, J. E. Fischer1
1Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104-6272
2Chemical and Biomolecular Engineering, University of Pennsylvania, 220 South 33rd Street, Philadelphia, PA 19104-6393
3Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104-6272; Chemical and Biomolecular Engineering, University of Pennsylvania, 220 South 33rd Street, Philadelphia, PA 19104-6393

Tóm tắt

Single-walled carbon nanotubes (SWNTs) are considered as promising filler materials for improving the thermal conductivity of conventional polymers. We carefully investigated the thermal conductivity of SWNT poly(methylmethacrylate) (PMMA) nanocomposites with random SWNT orientations and loading up to 9vol% using the comparative technique. The composites were prepared by coagulation and exhibit ∼250% improvement in the thermal conductivity at 9vol%. The experimental results were analyzed using the versatile Nielsen model, which accounts for many important factors, including filler aspect ratio and maximum packing fraction. In this work, the aspect ratio was determined by atomic force microscopy (AFM) and used as an input parameter in the Nielsen model. We obtained good agreement between our results and the predictions of the Nielsen model, which indicates that higher aspect ratio fillers are needed to achieve further enhancement. Our analysis also suggests that improved thermal contact between the SWNT network and the matrix material would be beneficial.

Từ khóa


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We cannot distinguish between the release of short tubes present in the initial material during sonication/exfoliation, versus cutting of tubes during sonication and dispersion.

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Thông tin xuất bản

Journal of Heat Transfer

Tập 129 Số 8

1096-1099

Thông tin tác giả