Water in urethane acrylates—1. Sorption and desorption properties of urethane acrylate-co-glycol acrylate networks

✍ Scribed by A.B. Clayton; P.E.M. Allen; D.R.G. Williams

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 504 KB
• Volume: 29
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(93)90153-7

✦ Synopsis

Sorption and desorption kinetics of water uptake in urethane acrylate and urethane acrylatecoglycol acrylate networks are reported and analysed in terms of Fick's and Frisch's laws. The Frisch parameter n calculated for sorption ranged from 0.4 to 0.6, while that for desorption ranged from 0.5 to 0.8. Two-stage sorption for some samples at low relative humidities was interpreted in terms of water clustering within the polymer, promoted by a high ratio of hydrophobic groups to polar water-solubilizing moieties.