Water blown free rise polyurethane foams.: An article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00098MU1A
ISBN-13978B00098MU14
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on January 1, 1999. The length of the article is 4701 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: 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 C[O.sub.2] 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.
From the supplier: Researchers are working on a new model that they can use to predict polyurethane foam bubble size distribution. Experiments have been done using water as a chemical blowing agent. Findings indicate that as more water is introduced to the mixture, bubble size density decreases. Water narrows bubble size distribution. A similar experiment was done using DuPont freon as the physical blowing agent. Bubble size density increased with the freon.
Citation Details
Title: Water blown free rise polyurethane foams.
Author: Debarsan Niyogi
Publication:Polymer Engineering and Science (Refereed)
Date: January 1, 1999
Publisher: Society of Plastics Engineers, Inc.
Volume: 39 Issue: 1 Page: 199(1)
Distributed by Thomson Gale
From the author: 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 C[O.sub.2] 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.
From the supplier: Researchers are working on a new model that they can use to predict polyurethane foam bubble size distribution. Experiments have been done using water as a chemical blowing agent. Findings indicate that as more water is introduced to the mixture, bubble size density decreases. Water narrows bubble size distribution. A similar experiment was done using DuPont freon as the physical blowing agent. Bubble size density increased with the freon.
Citation Details
Title: Water blown free rise polyurethane foams.
Author: Debarsan Niyogi
Publication:Polymer Engineering and Science (Refereed)
Date: January 1, 1999
Publisher: Society of Plastics Engineers, Inc.
Volume: 39 Issue: 1 Page: 199(1)
Distributed by Thomson Gale
