Abstract
The kinetics of the model reaction between ethylene glycol and N-acetyl-ϵ-caprolactam in the presence of different catalysts was investigated using differential isothermal calorimetry. Tetrabutyl orthotitanate was shown to be the most effective catalyst for the esterification of hydroxyl-containing compounds. It was shown that the reaction proceeded preferably by opening an exocyclic amide bond with the liberation of free ϵ-caprolactam. The optimum conditions were determined for the esterification of polyoxypropylene glycol by bis-imides leading to the formation of macromolecular initiators for use in reaction injection moulding of block copolyamides. Block copolyamide ethers on the basis of obtained prepolymers were synthesized and their properties were studied. These properties turned out to be essentially better than those of polycaproamide and the compositions of the analogous structure.
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