The role of alkaline hydrolysis in polyacrylamide modification: from structural transformations to new applications

This study analyzes the processes of alkaline hydrolysis of polyacrylamides and their copolymers with acrylamide, highlighting the mechanisms affecting the reaction rate and structural changes in polymers.The aim of the work is to determine the optimal hydrolysis conditions for controlling the molecular characteristics of the resulting polymers.The study highlights the importance of controlling the pH of the medium and the temperature conditions of the reaction, which directly affect the efficiency of hydrolysis and the quality of the final polymer materials.Kinetic analyses and the study of the viscosity of solutions reveal how changes in the hydrolysis process can modify the physico-chemical properties of polyacrylamides.Raman spectroscopy is used to detail structural rearrangements in polymers after hydrolysis, highlighting the role of intermolecular interactions and the influence of water.The results of the study enrich the understanding of polyacrylamide hydrolysis processes, providing a basis for the development of polymer materials with desired properties and improved characteristics for a wide range of applications.During the study of the effect exerted by the nature of the hydrolyzing cation on the efficiency of the reaction, it was found that at low alkali concentrations (MeOH ratio to PAA from 0.5 to 1), an increase in the degree of hydrolysis follows the sequence Li + < Na + = K + , indicating the absence of noticeable differences in the kinetics and efficiency of PAA hydrolysis when using sodium and potassium hydroxides in this range

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