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Modeling the Dynamics of Reactive Foaming and Film Thinning in Polyurethane Foams

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Title Modeling the Dynamics of Reactive Foaming and Film Thinning in Polyurethane Foams
 
Creator HARIKRISHNAN, G
KHAKHAR, DV
 
Subject free rise
polyurethane foam
cell opening
film thinning
residual lamellar thickness
 
Description Flexible polyurethane foams are widely used in cushioning and packaging applications. A model for the dynamics of formation of polyurethane foams is presented, which includes thinning of foam lamellae. Experimental measurements for water blown flexible foam,formulations at different water concentrations are presented to validate the model. Adiabatic temperature rise measurements during foaming are used to obtain the kinetic parameters of the reactions of isocyanate with polyol and water. The variation of foam density during foaming is studied by weight loss and video shooting methods and both are compared to estimate the amount of blowing gas lost during foaming. The average thickness of the foam lamellae of the solid foam is obtained by SEM measurements. The predictions of the model show good agreement with the experimental measurements of temperature and density with time and the final lamellar thickness. The results are important for understanding the cell opening process. (C) 2009 American Institute of Chemical Engineers AIChE J, 56: 522-530. 2010
 
Publisher JOHN WILEY & SONS INC
 
Date 2011-08-16T10:04:04Z
2011-12-26T12:54:53Z
2011-12-27T05:43:14Z
2011-08-16T10:04:04Z
2011-12-26T12:54:53Z
2011-12-27T05:43:14Z
2010
 
Type Article
 
Identifier AICHE JOURNAL, 56(2), 522-530
0001-1541
http://dx.doi.org/10.1002/aic.12002
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9465
http://hdl.handle.net/10054/9465
 
Language en