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Estimation of thermal conductivity of polyethylene resins

1981; Wiley; Volume: 21; Issue: 3 Linguagem: Inglês

10.1002/pen.760210303

1548-2634

Richard R. Kraybill,

Polymer crystallization and properties

Abstract Methods of predicting and correlating thermal conductivity of polyethylene resins in solid and melt states are discussed herein. Dependence on crystallinity or density is estimated for the solid state by a form of Maxwell's equation for electrical conductivity. An equation is presented for predicting melt thermal conductivity based upon Bridgman's theory of energy transport and pressure‐volume‐temperature (PVT) data. The effect of pressure on melt thermal conductivity is calculated from the theory. The effect of pigmentation for near spherical particles up to approximately 2.5 volume percent is also correlated by a form of Maxwell's equation. Experimental thermal conductivities of unpigmented and pigmented polyethylene resins from 50 to 300°C are in good agreement with theoretical predictions and with literature data.