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Low temperature transitions in a crosslinked urethane
Author(s) -
Wischmann Kenneth B.,
Brassell Gilbert W.
Publication year - 1973
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760130207
Subject(s) - materials science , torsion pendulum clock , glass transition , prepolymer , steric effects , atmospheric temperature range , polymer , solvent , curing (chemistry) , swell , transition temperature , polymer chemistry , composite material , thermodynamics , organic chemistry , condensed matter physics , chemistry , polyurethane , physics , superconductivity , quantum mechanics
We have investigated the low temperature transitions in a urethane prepolymer crosslinked with various amines and triols by measuring their dynamic mechanical properties over a temperature range of 25°C to approximately − 190°C. In the formulations studied, a low temperature transition was observed near − 140°C and the transition was shown to be related to the electronic and steric influences of the curing agent structure at the crosslink site. A quantitative relationship was demonstrated between the low temperature transition peak intensity and the polymer's crosslink density. The above relationships were derived from torsion pendulum and solvent swell experimentation.