3 years ago

Absolute characteristics and conformation of cationic polymers by hydrodynamic approaches: Poly(AEMA-co-MAEMA-co-DMAEMA)stat copolymers

Absolute characteristics and conformation of cationic polymers by hydrodynamic approaches: Poly(AEMA-co-MAEMA-co-DMAEMA)stat copolymers
Сationic poly((2-aminoethyl)-methacrylate–co-N-methyl-(2-aminoethyl)-methacrylate-co-N,N-dimethyl-(2-aminoethyl)-methacrylate) copolymers were synthesized by reversible addition-fragmentation chain transfer polymerization in a wide range of molar masses 16 , 000 < M , g mol - 1 < 130 , 000 and narrow dispersities. The copolymers were investigated by a wide range of characterization techniques such as sedimentation velocity, intrinsic viscosity, translation diffusion, asymmetric flow field-flow fractionation, as well as standard SEC and NMR analysis. As a result a matrix of self-consistent parametric macromolecular characteristics and the absolute molar masses were obtained. Consistent Kuhn-Mark-Houwink-Sakurada scaling relationships were found for 0.2 M NaCl water ( [ η ] = 0.002 × M 0.85 , s 0 = 0.0231 × M 0.41 , D 0 = 2 , 349 × M - 0.59 ) and 0.2 M NaOH water ( [ η ] = 0.022 × M 0.50 ) solvent system. The corresponding conformational characteristics of the macromolecules, that define the polymer behavior in solution – equilibrium rigidity and diameter of the polymer chain, were determined to be A = 4.3 nm and A = 1.1 nm for 0.2 M NaCl and 0.2 M NaOH respectively. Additionally, the anisotropic optical properties were studied by the flow birefringence revealing information about optical anisotropy of the monomer unit ( Δ a = - 1.5 × 10 - 25 cm 3 ). The presented study exemplifies the in-depth analytical characterization of cationic/charge polymers by the fundamental hydrodynamic approaches resolving the essential macromolecular characteristics and solution behavior.

Publisher URL: www.sciencedirect.com/science

DOI: S0014305717315185

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