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On the temperature dependence of the thermal conductivity of linear amorphous polymers

Authors
Journal
Polymer
0032-3861
Publisher
Elsevier
Publication Date
Volume
37
Issue
2
Identifiers
DOI: 10.1016/0032-3861(96)81092-5
Keywords
  • Thermal Conductivity
  • Phonon Scattering
  • Linear Amorphous Polymers

Abstract

Abstract The present study reveals that the observed variation of thermal conductivity λ with temperature, for any non-conducting linear amorphous polymer can be explained by considering phonons as chief heat carriers. It is proposed that in the temperature region below the glass transition temperature, T g, structure scattering and chain-defect scattering are the predominant phonon scattering processes, while above T g, vacant-site scatterings also play a significant role. Owing to the effect of temperature on the movement of structural units, the thermal resistances corresponding to these scattering processes have temperature dependence. Accordingly, relations for λ can be deduced using Matthiessen's rule. Calculated values of poly(vinyl chloride) with 0%, 10%, 20% and 40% plasticizers and several different styrene polymers are in excellent agreement with the reported experimental data, over a wide range of temperatures around T g, maximum deviations being ∼ 3%.

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