Journal
POLYMER SCIENCE SERIES C
Volume 49, Issue 3, Pages 251-254Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1811238207030095
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The results are reported of studies of adhesives based on polyurethanes containing carborane groups. It is established by TGA methods that for polyurethane-carborane systems, total mass losses upon heating to 600 degrees C are equal to 20%, whereas for adhesives free of carborane groups, such losses are equal to 80%. It is revealed that the properties of the adhesives studied are substantially affected by carborane isomeric structure. Compositions containing polyestercarboranes with m-carborane provide higher stability of adhesive joints to elevated temperatures. Results of the study of the kinetics of gas evolution are reported and the scheme of the two-stage mechanism of thermal degradation is proposed. Results of IR spectroscopy analysis show that upon the curing of carborane-containing polyurethane composition, isocyanate groups of polyisocyanate first interact with hydroxyl groups of polyestercarborane, which results in the formation of macrodiisocyanates. Subsequent heating to 350 degrees C leads to further curing of compositions that involves carborane, ester, and polyurethane groups.
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