Mulligan, D R; Brown, C S; Fry, A; Percio, S (2001) Effect of pressure on thermal conductivity of polymers. NPL Report. MATC(A)33

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Abstract

The effect of pressure on thermal conductivity of five commercial polymers has been investigated. The five materials were selected as representatives of materials frequently used in industry. The materials were; a polypropylene, a high-density polyethylene, a polystyrene, a talc filled polypropylene and a glass filled polypropylene. A short review of thermal conductivity theory is presented and practical details of measurements at elevated pressure are described. Far all materials the thermal conductivity was found to increase linearly with pressure, but the magnitude of the increase varied greatly between the materials. Results for ambient pressure, extrapolated from the elevated pressure values, were generally found to be higher than the values directly measured at ambient pressure. Possible explanations for this difference are offered and the implications for measurements are discussed. This report shows that for some commercial polymers the effect of pressure on thermal conductivity is important and can have a significant impact on processing parameters, such as predicted cycle times, derived from thermal conductivity values.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MATC(A)33
Subjects:	Advanced Materials Advanced Materials > Thermal Performance Advanced Materials > Polymers
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2025

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