Acoustic Characteristics and Thermal Properties of Polycarbonate/(Graphite Intercalation Compound) Composites

초록

Graphite intercalation compound (GIC) contained polycarbonate (PC) composites were prepared by melt mixing and the effects of GIC and its surface treatment using oleylamine (OA) on the morphology and properties of the poly carbonate based composites were examined. As increasing the GIC contents, the sound absorption coefficient and sound transmission loss of the PC/GIC composites increased over the frequencies of 500 similar to 4000 Hz. The OA treatment of GICs improved the interfacial bonding and dispersion of GICs in the PC matrix and it allowed less voids and the smoother fractured surfaces compared to the PC composites with the untreated GIC fillers. Compared to the bare PC, the PC/GIC (20 wt%) composites showed the higher absorption coefficient at 4000 Hz. The absorption coefficient at 4000 Hz, sound transmission loss, and thermal conductivity of the PC/GIC (20 wt%) composites were 0.08, 34 dB, and 1.12 W/mK, respectively. At 20 wt% of GIC loading, the sound transmission loss at 2000 Hz increased to 39 dB from 12 dB of the bare PC. These results indicate that the PC/GIC composites with lower surface density could be more suitable compared to the stainless steel in the fields that require the sound absorption and sound blocking with a light weight.

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