Influence of pressure and chemical structure on the thermal conductivity of vitreous poly(alkyl methacrylates). II. Relation to free volume

Autor:	R. Y. S. Chen, R. E. Barker, R. S. Frost
Rok vydání:	1978
Předmět:	chemistry.chemical_classification Equation of state Materials science Anharmonicity General Engineering Thermodynamics Polymer Grüneisen parameter Condensed Matter::Soft Condensed Matter Thermal conductivity Volume (thermodynamics) chemistry Polymer chemistry Glass transition Alkyl
Zdroj:	Journal of Polymer Science: Polymer Physics Edition. 16:689-694
ISSN:	1542-9385 0098-1273
DOI:	10.1002/pol.1978.180160410
Popis:	A quantitative model for the pressure dependence of the thermal conductivity K in glassy polymers is presented. By extending the hole theory of liquids to temperatures below the glass transition temperature, an equation of state is obtained and an expression for the pressure dependence of the thermal conductivity is then formulated from a consideration of the anharmonicity associated with the segmental vibrations. The resulting equation ΔK/K = γGf0[1−exp(−p/B*)], where γG is the Gruneisen parameter, f0 is the fractional free volume, and B* = kTg/V0, is compared with experimental results for the poly(alkyl methacrylates).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d534534aa81e8ee9fd5298846558c425 https://doi.org/10.1002/pol.1978.180160410 Zobrazit plný text záznamu Plný text