I. Perevyazko, A. Lezov, A. Gubarev
Nov 7, 2019
Citations
0
Influential Citations
9
Citations
Journal
Polymer
Abstract
Abstract Here we present a combined analytical study of a homological series of poly(2-(dimethylamino)-ethyl methacrylate)s (DMAEMA) and their corresponding with methyl iodide quaternized versions poly[2-(methacryloyloxy) ethyl] trimethyl-ammonium iodide]s (QDMAEMA) in a wide range of molar masses ( ~ 7 to ~ 300 k D a ) and low dispersities ( ~ 1.1 to ~ 1.3 ). The polymers were studied predominantly in 0.2 M N a C l in water at T = 20 . 0 ° C applying mutually reinforcing's set of hydrodynamic methods, such as, viscometry, analytical ultracentrifugation, dynamic light scattering, isothermal diffusion and size exclusion chromatography. The manuscript provide compulsory discussions on the evaluation of physically sound values of the molar masses, hydrodynamic sizes and conformations of the macromolecules in solution. Special attention is paid to the investigation of ion-specific interactions and their influence on the hydrodynamic and molecular characteristics. The conformation of polymer chains in solution was validatedvia the classical scaling equations showing θ-conditions – [ η ] = 0.055 M 0.47 ± 0.04 ; s = 0.006 M 0.50 ± 0.02 ; D = 1200 M - 0.50 ± 0.02 for the initial DMAEMAs polymer chains and thermodynamically good ones for the quaternized macromolecules characterized by [ η ] = 0.002 M 0.80 ± 0.04 ; s = 0.0133 M 0.45 ± 0.02 ; D = 1665 M − 0.55 ± 0.02 . The equilibrium rigidity was found to be visibly influenced by the overall electrostatic interactions and the presence of closely associated iodine ions to the quaternized polymer chains giving A = 4.4 n m in comparison to A = 2.4 n m for the initial macromolecules.