Effect of the grafting degree on the properties of copolymers based on polyacrylic acid and methylcellulose
Abstract
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.
References
1 Gulten G, Shokat S (2013) Cellulose graft copolymers: synthesis, properties, and applications. In: Polysaccaride based graft copolymers. Part 2. Springer-Verlag Berlin Heidelberg, Germany. P.15-57. http://dx.doi.org/10.1007/978-3-642-36566-9
2 Nurpeissova ZhA, Mangazbaeva RA, Shaikhutdinov EM, Khutoryanskiy VV (2013) Chemical Bulletin of Kazakh National University 2:27-33. (In Russian). http://dx.doi.org/10.15328/chemb_2013_227-33
3 Gavrilin MV (2001) Chemical Pharmaceutical Journal [Himicheskiy pharmacevticheskiy zhurnal] 35:33-37. (In Russian)
4 Nurkeeva ZS, Mun GA, Khutoryanskiy VV, Mangazbaeva RA (2000) Polym Int 49:867-870. http://dx.doi.org/10.1002/1097-0126(200008)49:8<867::AID-PI472>3.0.CO;2-O
5 Nurkeeva ZS, Mun GA, Khutoryanskiy VV (2003) Macromol Biosci 3:283-295. http://dx.doi.org/ 10.1002/mabi.200390037
6 Khutoryanskiy VV, Cascone MG, Lazzeri L, Nurkeeva ZS, Mun GA, Mangazbaeva RA (2003) Polym Int 52:62-67. http://dx.doi.org 10.1002/pi.1004
7 Mangazbaeva RA, Omarova MM, Khutoryanskiy VV (2001) Chemical Bulletin of Kazakh National University 2:258-259. (In Russian)
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License (CC BY-NC-ND 4.0) that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
