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Mechanical properties of crosslinked polyurethanes

✍ Scribed by W. Dzierża

Publisher
John Wiley and Sons
Year
1978
Tongue
English
Weight
511 KB
Volume
22
Category
Article
ISSN
0021-8995

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✦ Synopsis

Stress-strain and stress-relaxation behavior of polyurethane elastomers based on poly(ethy1ene adipate), poly(ethy1ene maleate), polyethylene glycol, and 4,4'-diphenylmethane diisocyanate (MDI) have been studied. The elastomers were crosslinked by an excess of MDI and by dicumyl peroxide (DiCup); the latter was supposed to form additional crosslinks on the unsaturated bonds. The determined values of Young's modulus, Mooney-Rivlin elastic parameters C1 and Cz, relaxation moduli E(10 sec) and E(100 sec), as well as relaxation speed were used to estimate the effect of MDI-and DiCup-formed crosslinks on the mechanical behavior of polyurethanes. It was found that while the elastomers crosslinked by MDI only apparently displayed viscoelastic properties, the polyurethanes additionally crosslinked by DiCup exhibited more elastic behavior. The results obtained were explained on the basis of changes in the amount of secondary bonding due to the additional network junctions formed by DiCup a t nonpolar groups.

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