Abstract:

A systematic study about the absorption of small molecules into polyurethane was undertaken in supercritical carbon dioxide. Changes in mass of PU were given in terms of the changes of factors such as decompression time, solubility parameter, electrophilic and aromatic character of small molecules. The effect of specific evaporation velocity of small molecules on desorption was observed. The results showed that polyurethane is easy to absorb electrophilic and aromatic compounds. The more rapid its specific evaporation velocity is, the faster the small molecule is desorbed.

Key words: Supercritical carbon dioxide, Polyurethane, Absorption, Effect