碳纳米管对PMMA和PC导热性能的影响
Modification of Thermal Conductivity of PMMA and PC by making their Nanocomposites with Carbon Nanotubes
摘要：
PMMA和聚碳酸酯（PC）是很好的低成本材料，可以很容易地定制和成型。然而，它们具有差的机械、热和电性能，这些性能在几种应用中需要增强，在这些应用中，除了高强度之外，快速传热成为必要条件。碳纳米管（CNT）是一种具有优异力学性能和输运性能的新型材料。在本文中，我们报告的结果制造不同浓度的碳纳米管与PMMA和PC的复合材料和测量的热导率数据通过一个简单的瞬态热流。制造了直径约为2 cm、厚度为0.2 cm的圆盘状样品，CNT浓度变化高达10 wt %。通过将盘的一端保持在蒸汽温度下，在10秒后记录每个样品的另一端的温度。温度的升高与适当校准的热导率相关。我们发现，PMMA和PC测量高的热导率与碳纳米管浓度的增加。PMMA的热导率在10wt%的CNT下从约0.2W/mK上升到0.4W/mK，而对于PC，其在10wt%的CNT下从约0.2W/mK上升到0.9W/mK。因此观察到，通过在PMMA和PC中仅使用高达10重量%的CNT来制造基于CNT的复合材料并且使得这些材料中的热耗散更快，可以容易地实现热性能的改性。
英文摘要：
PMMA and Poly carbonate (PC) are wonderful low cost materials which can be easily tailored and shaped. However they have poor mechanical, thermal and electrical properties which are required to be enhanced in several applications where along with high strength, a quick heat transfer becomes a necessity. Carbon nanotubes (CNT) are excellent new materials having extraordinary mechanical and transport properties. In this paper we report results of fabricating composites of varying concentrations of CNTs with PMMA and PC and measurements of thermal conductivity data by a simple transient heat flow. The samples in disk shapes of around 2 cm diameters and 0.2 cm thickness with CNT concentrations varying up to 10 wt percent were fabricated. By keeping one end of the discs at steam temperature, the temperature of the other end was noted for each sample after 10 s. The rise in temperature was correlated with thermal conductivity which was appropriately calibrated. We found that both PMMA and PC measured high thermal conductivity with increase in the concentration of CNTs. The thermal conductivity of PMMA rose from about 0.2 W/mK to 0.4 W/mK at 10 wtpercent of CNT whereas for PC, it rose from about 0.2 W/mK to 0.9 W/mK at 10 wt percent of CNT. It is thus observed that modification in thermal properties is easily achieved by making CNT based composites using only up to 10 wt percent of CNTs in PMMA and PC and enabling quicker heat dissipation in these materials.
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