Cast polyurethane elastomers obtained with N,N′-ethyleneurea and 1,4-butanediol as chain extenders

✍ Scribed by M. Debowski; A. Balas

• Book ID: 101254353
• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 126 KB
• Volume: 75
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(20000131)75:5<728::aid-app16>3.0.co;2-#

✦ Synopsis

Tensile properties and dynamic mechanical thermal properties for polyurethane elastomers extended with N,NЈ-ethyleneurea (EU) and 1,4-butanediol (1,4-BD) were investigated. Also gel permeation chromatography and extraction experiments for selected elastomers were performed. EU residues were introduced into polyurethane during prepolymer synthesis at 140°C. Such prepolymers with built-in EU residues were extended with 1,4-BD for different [NCO]/[OH] molar ratios. The use of EU chain extender produces in general polymers with inferior mechanical properties compared to the typical 1,4-BD based polyurethanes, although some of the EU-based polymers show improved strain-stress parameters.