Features of modification of polyaminoamides with rosin-maleic adducts

Abstract

The features of the process of chemical modification of polyaminoamides based on adipic acid and diethylenetriamine with rosin-maleic adducts differing in the content of maleopimaric acid (8.55; 16.46 and 31.12 % wt.) are considered. Modification of polyaminoamides with rosin-maleic adducts in the amount equal to the number of secondary amino groups in the repeating unit of the polymer was carried out in the melt at temperature 160–180 °C for 3 h under continuous stirring. The process was controlled by monitoring the change in the acid and amine numbers of the reaction mass. The most intensive modification of polyaminoamides by rosin-maleic adducts with different content of maleopimaric acid occurs within 1 h. It has been established that the rosin-maleic adduct with the 16.46 % wt. content of maleopimaric acid reacts with polyaminoamides and the degree of polymer modification reaches 57.39 %. The structure of the synthesized products was studied by IR-spectroscopy. The studied physicochemical properties (solubility, softening point, viscosity of solutions, acid and amine numbers, etc.) of the obtained products indicate that the reaction products are complex mixtures that consist of chemically modified polyaminoamides, N-substituted maleopimaric acid imides and unreacted rosin-maleic adducts (free resin and maleopimaric acids).