The structure and elasticity of polyurethane networks View Full Text


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Article Info

DATE

1982-10

AUTHORS

M. Ilavský, K. Dusek

ABSTRACT

If isocyanate groups are in excess networks prepared from poly(oxypropylene)triols (PPT) and 4,4′-diphenylmethanediisocyanate (MDI) in the presence of an organotin catalyst have higher values of the equilibrium modulus G and of the gel fraction wg compared with theoretical predictions in which only the formation of urethane bonds is considered. If however, the NCO groups in excess were reacted with monofunctional phenyl isocyanate keeping the molar ratio [OH]/[NCO]=1 constant, networks with a wide range of crosslinking density were obtained, for which the G and wg values were in a good accord with the theory. The probable cause of departures in the PPT-MDI systems with NCO groups in excess consists in the formation of allophanate groups. An analysis of the equilibrium elastic behaviour of these net-works has shown that the trapped entanglement contribution to the equilibrium modulus is likely to occur. More... »

PAGES

359-366

Journal

TITLE

Polymer Bulletin

ISSUE

7-8

VOLUME

8

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00264926

DOI

http://dx.doi.org/10.1007/bf00264926

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1006605916


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