Effect of the grafting degree on the properties of copolymers based on polyacrylic acid and methylcellulose
In this work, by potentiometric titration, the dissociation of the grafted chains of polyacrylic acid in copolymer composition was studied. An increase in the content of units of acrylic acid (AA) in the copolymer leads to a decrease in the values of dissociation constants, that is, the acidic properties are weaken. It was shown that the extension of the grafted copolymer chains in MC-g-PAA as well as the enhancement of the interaction between the basic and graft chains of the copolymer result in the formation of intra- and intermolecular complexes by a system of hydrogen bonds. Also, by viscometry, the effect of the temperature and pH on the rheological properties as well as phase transitions in aqueous solutions of graft copolymers based on polyacrylic acid and methyl cellulose (MC-g-PAA) have been investigated. It was demonstrated that the content of the grafted polyacrylic acid affects physicochemical characteristics of the grafted copolymer. Grafting of AA onto a polysaccharide chain allows creation of a pH-dependent system, resulting in an increase in the solution viscosity of the copolymer with increasing pH.
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