Opto-thermal technique for measuring thermal conductivity of polyacrylonitrile based carbon fibers

다국어 초록 (Multilingual Abstract)

Thermal conductivity of carbonfibers (CFs) is an important property because CFs are used as heatdissipationfillers in composites for aerospace and electronics applications. However, evaluating thermalconductivity of a singlefilament of CFs is an arduous task due to dimensional issue of specimens andlimitations of conventional measurement system. Therefore, we suggest an opto-thermal techniqueusing Raman spectroscopy to measure thermal conductivity of commercial polyacrylonitrile based CFs(T300, T700SC and T800 H). The opto-thermal technique used that G band from Raman spectroscopy ofcarbon materials is shifted depending on temperature. For verifying an accuracy of the technique, thelaser absorbance of CFs were estimated, and the thermal conductivity was measured depending on thelength of CF. The measured data were reflected in the thermal conductivity calculation formula. It wasdemonstrated that the method provides more reasonable thermal conductivity values compare to aconventional Angstrom method. In addition, this simple technique confirmed that graphitic structure ofCFs played a critical role in their thermal conductivity.

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