A Model of aging for gas-filled cellular plastics

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Journal titleJournal of Cellular Plastics
Pages32747; # of pages: 281
SubjectThermal Insulation; aging; cellular plastics; thermal resistance; polyurethane; thermal conductivity; aging; cellular plastics; gas-filled foams; long-term thermal resistance; model of aging; polyurethane; thermal conductivity; Cellular plastics (plastic foam); Foam; Isolation thermique; vieillissement; plastique alvéolaire; résistance a la chaleur; polyurethanne (thermodurcissable); conductivit é thermique
AbstractDuring the service life of gas-filled cellular plastics ( GFCP), air diffuses into the foam cells and the gaseous blowing agent diffuses out, each at a rate that depends on the type of polymer and temperature. This process, which reduces the effectiveness of insulation, is known as aging. This paper presents a model for calculating the thermal resistance of the GFCP slab as a function of time. It incorporates the effect of phase changes (condensation and evaporation) in the gaseous blowing agent and the use of material characteristics (diffusion coefficient) varying in the cross-section of the GFCP slab. The results are compared with measurements.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NoteAlso published in Improved Thermal Insulation : Problems and Perspectives
Peer reviewedYes
NRC number29770
NPARC number20375296
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Record identifier8f030d6a-3e5a-43be-83d5-516f766a755f
Record created2012-07-23
Record modified2016-05-09
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