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Microphase separation and properties of urethane elastomers
Author(s) -
Nierzwicki W.,
Wysocka E.
Publication year - 1980
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.1980.070250503
Subject(s) - materials science , adipate , elastomer , diamine , diol , polyurethane , swelling , ethylene glycol , polymer , polymer chemistry , composite material , polymer science , chemical engineering , engineering
Several polyurethanes were prepared from poly(ethylene adipate)glycol, 4,4′‐diphenylmethane diisocyanate, 1,4‐butanediol, or 3,3′‐dichloro‐4,4′‐diaminodiphenylmethane. Thermomechanical curves were determined for all investigated systems, and the glass transitions found thereof formed the basis of subsequent analysis. The analysis showed that the investigated systems belonged to those polyurethanes that can undergo microphase separation. It was also shown that the separation in the diamine‐extended elastomers was less sensitive to changes in chemical composition than in the diol‐extended systems. The diamine‐based polyurethanes were also closer to the ideal separation than the diol‐extended elastomers. Examinations of elastomers of varying amount of chemical crosslinking revealed a joint action of the crosslinking and microphase separation in determining mechanical properties of the systems. Together with swelling measurements, the examinations showed that optimum mechanical properties were obtained while keeping a very careful balance between these two factors.