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Absorption of water by polyurethane foam. modelling and experiments

โœ Scribed by A. Sabbahi; J.M. Vergnaud

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
302 KB
Volume
29
Category
Article
ISSN
0014-3057

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โœฆ Synopsis

Polyurethane (PU) foams are made of small cells, regular in shape, which result from the presence of a gas acting as a blowing agent during its formation (carbon dioxide or fluorocarbon). When the PU foam is in contact with water, a matter transfer is observed, water diffusing into the foam. The presence of the blowing agent in the cells is responsible for hindered diffusion of the water. The same PU foams are immersed in water and dried; the process of absorption-resorption repeated many times shows a change in the diffusivity for the following stages of absorption. The diffusivity is considerably lower for the first absorption than for the following absorptions. Moreover, a finite coefficient of matter transfer is observed for the first absorption, while this coefficient is very high with the following absorptions.

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Absorption of water at 100ยฐC by polyuret
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โœ A. Sabbahi; J.M. Vergnaud ๐Ÿ“‚ Article ๐Ÿ“… 1991 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 358 KB

Akstract--The absorption of water at 100C by polyurethane (PU) foam is described by considering transient diffusion with constant diffusivity. Sheets of PU foam are used, with a one-, di-or tri-dimensional transport of water through the sheet. Numerical models, with finite differences, are capable o

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The kinetics of absorption and desorption with a one-dimensional transport are drawn as they are obtained from experiments and calculation, and the profiles of concentration expanded through the thickness of the PU sheet are calculated. The stage of absorption is described by transient diffusion wit