Water blown free rise polyurethane foams

Niyogi, Debdarsan ; Kumar, R. ; Gandhi, K. S. (1999) Water blown free rise polyurethane foams Polymer Engineering & Science, 39 (1). pp. 199-209. ISSN 0032-3888

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Official URL: http://www3.interscience.wiley.com/journal/1080634...

Related URL: http://dx.doi.org/10.1002/pen.11408


A model is developed in this work for predicting the bubble size distribution in polyurethane foams generated by using water as a chemical blowing agent. The model combines equations of energy balance, kinetics of the reactions of isocyanate with water and polyol, and nucleation and growth of CO2 bubbles. It is found that as the water content of the reaction mixture is increased, the mean bubble size decreases and the bubble size distribution become narrower. Exactly the opposite occurs in polyurethanes foamed with a physical blowing agent, e.g., DuPont Freons. This suggests that a combination of physical and chemical blowing agents can be employed to control bubble size distribution.

Item Type:Article
Source:Copyright of this article belongs to Society of Plastics Engineers.
ID Code:11487
Deposited On:16 Nov 2010 13:54
Last Modified:02 Jun 2011 04:58

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