The structures of novolac monoalkyl(C8-C12)phenol-formaldehyde oligomers, modified with imidazolines based on natural petroleum acids and polyamines-diethylenetriamine, triethylenetetraamine, polyethylenepolyamines were investigated by IR-spectroscopy. As a result of the analysis of the IR-spectra of the initial and final products, the reaction mechanism is proposed.
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