TO THE QUESTION ABOUT THERMAL BEHAVIOUR OF AMINOFENOLNY HARDENERS IN EPOXY POLYMERS
Using thermogravimetric analysis was studied the thermal behavior of the industrial samples of hardener AF-2 and laboratory samples of new aminophenol hardeners obtained by aminomethylation reaction. It was found that the investigated industrial samples of hardener AF-2 different manufacturers up to a temperature of 70?°С lose about 3?% from weight sample, up to a temperature of 100?°С the sample AF-2 manufactured by JSC «Sterlitamak Petrochemical Plant» loses 5?% of weight, whereas the sample manufactured by JSC «Kotlas Chemical Plant» loses 5,9?% of weight. Laboratory samples of aminophenol hardeners up to a temperature of 70?°С lose 1,7–4,8?% of weight depending on the conditions of their preparation except the samples, received at a molar ratio of reagents fenol:paraform:ethylenediamine = 1:2:2 at a temperature 65?°C. The presence of volatile components in aminophenol hardeners allows obtaining epoxy polymer foam without additional introduction of blowing agent into the composition. It is revealed, that composition volume at curing increases 5 times with polymer formation, having an apparent density of 0,118–0,040 g/cm3.