Investigation of the Effect of Mono- and Diurethane Units on the Deformation and Strength Properties of Polyurethanimides

摘要

The effect of synthesis conditions for macrodiisocyanate (temperature, reaction duration, ratio of components) based on poly(diethylene glycol adipate) (M-n = 2.5 x 10(3)) and 2,4-toluene diisocyanate on the composition of the reaction products has been studied. The number of mono- and diurethane units was estimated using proton magnetic resonance spectra. It was found that carrying out the synthesis at 80 degrees C using an eight-fold excess of 2,4-toluene diisocyanate results in the production of a macrodiisocyanate with a diurethane unit content of less than 1 mol %. Based on the isolated macrodiisocyanate, a fusible polyurethanimide, superior in elasticity to the unmodified analogue, was prepared.