Author: Galina
Company: SPbSU

Specialization: 010700 Physics of condensed matter
Program: 11 Physics of polymers and liquid crystals
Program director: Prof. Е.I. Rjumtsev
Department of Polymer Physics
Scientific supervisor: associate professor G.E. Polushina 
Referee: assistant E.V. Lebedeva

Molecular properties of carboxybetaine 
copolymers in aqueous solutions
A.O. Paristov
This work deals with the study of hydrodynamic and conformational properties of copolymers formed by diallyl-N-dimethylammonium and diallyl-N-methylammonio acetate molecules in aqueous solutions, with different ionic strength.
Six samples of copolymers were investigated by using viscosimetry, dynamic and static light scattering methods in aqueous solutions with different ionic strength and pH values.
Weight-average molecular masses M_w of copolymers samples were found via static light scattering in 1 M NaCl solutions. The translation diffusion coefficients D_0 and intrinsic viscosities of samples were measured in mediums with different ionic strength. Hydrodynamic radius R_h and polymerization degree of samples were calculated. The dependence of Kuhn segment length on copolymer composition  was established. The conformational properties of molecules of samples were studied in wide ranges of pH values and ionic strength.

The list of publications
1.	Paristov A.O., Ivanov A.D., Lezov A.A. Hydrodynamic properties of carboxybetaine copolymers in aqueous solutions. Abstract book of 7^th Saint-Petersburg Young Scientists Conference “Modern problems of polymer science”. St. Petersburg. 2011. P. 77.
2.	Paristov A.O., Ivanov A.D., Lezov A.A. Molecular-mass and hydrodynamic properties of carboxybetaine copolymers in aqueous solutions. Conference abstracts of International student conference “Science and progress”. St.Petersburg. 2011. P. 233.
3.	Paristov A.O. Hydrodynamic properties of interpolyelectrolyte complexes in chloroform. Abstract book of 6^th Saint-Petersburg Young Scientists Conference “Modern problems of polymer science”. St. Petersburg. 2010. P. 181.