Some Effects Of Gas Transfer On Rigid Foam Performance

Foam properties subject to the action of transfer phenomena include thermal conduc tivity (variable gas-phase composition) and dimensional stability (variable total gas pres sure). The commercial importance of such qualities suggests that a detailed analysis of basic mechanisms should contribute to...

Full description

Saved in:
Bibliographic Details
Published in:Journal of cellular plastics 1965-01, Vol.1 (1), p.224-228
Main Author: Harding, R.H.
Format: Article
Language:English
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Foam properties subject to the action of transfer phenomena include thermal conduc tivity (variable gas-phase composition) and dimensional stability (variable total gas pres sure). The commercial importance of such qualities suggests that a detailed analysis of basic mechanisms should contribute to a more rapid advance of rigid foam application tech nologies. Simultaneous consideration of transfer rate theory and material balances produced a model which characterizes the partial pres sures of gases contained within unicellular foams. A supplemental method for systemati cally evaluating resultant unsteady-state nu merical matrices was also developed. A few selected effects of polymers, blowing agents, specimen thickness and surface condition, specimen age, and environmental factors were then discussed and related generally to boards cut from air-filled (polystyrene) and fluorocarbon-blown (urethane) foams.
ISSN:0021-955X
1530-7999
DOI:10.1177/0021955X6500100128