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NCO/NH 2 ratio in ureaurethane elastomers and microphase separation
Author(s) -
Nierzwicki W.
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070330415
Subject(s) - elastomer , isocyanate , materials science , polymer , diol , polymer chemistry , polyurethane , polymer science , chemical engineering , composite material , engineering
Several polyureaurethanes were prepared from Adiprene prepolymers and 3,3′‐dichloro‐4,4′‐diaminodiphenylmethane. The NCO/NH 2 ratio was allowed to vary from 0.97 to 1.29. The polymers were investigated with pulsed NMR technique and characterized thermomechanically. The results show that, contrary to diol extended polyurethanes, the crosslinking resulting from excess isocyanate does not affect the microphase separation developing in these systems. It does affect, however, mechanical properties of these polymers.