Abstract
Kinetics of the reaction between 3-chlorophenylisocyanate and telechelic hydroxyl-terminated polybutadienes ( M=3000 to 7000), catalysed by ferric acetylacetonate has been studied by microcalorimetry. A mechanism is proposed for the catalytic action, which takes into account the role of π-bonded and self-associated hydroxyl groups. Stability constants have been determined for complexes of the catalyst with hydroxyl groups of the two types, and also the rate constants valid in the limiting stage of the catalysed reaction.
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