Measuring and predicting in-plane thermal conductivity of carbon-filled nylon 6,6 polymer composites

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In this study, two different carbons (synthetic graphite particles and carbon fiber) were added to nylon 6,6, and the resulting composites were tested for both the through-plane thermal conductivity k thru and the in-plane thermal conductivity k in, using the transient plane source method. The first goal of this work was to use a finite element model to develop a procedure to accurately measure the material properties using this relatively new analytical procedure. Reproducible data can be obtained for nylon 6,6 polymer composites, by choosing a power dissipation (an input parameter to the transient plane source method) corresponding to a sensor temperature increase of 2 K above the initial temperature after 5 s. The second goal of this work was to develop a simple empirical model for the in-plane thermal conductivity, which is easily measured with the transient plane source method. The results show that the product of the through-plane and in-plane thermal conductivities is a linear function of the volume percent φ. As the through-plane thermal conductivity of these composites is accurately predicted with a modified Nielsen model, this empirical relationship can be used to estimate in-plane thermal conductivities for a range of applications. © 2005 Society of Plastics Engineers.

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Polymer Composites