Molecular properties of modified chitosan containing a quaternary amino group |
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Authors: | N P Yevlampieva M Yu Gorshkova I F Volkova E S Grigoryan A A Lezov A P Khurchak E I Ryumtsev |
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Institution: | 1.Fock Institute of Physics,St. Petersburg State University,Petrodvorets,Russia;2.Topchiev Institute of Petrochemical Synthesis,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | A homologous series of the chitosan derivative N-(2-hydroxy-3-trimethylammonium)pro-pyl]chitosan in a 0.33 M CH3COOH + 0.2 M CH3COONa mixture is studied via viscometry and static and dynamic light scattering. The molecular masses of the homologous series
are determined, and the scaling relationships for the intrinsic viscosity, translational-diffusion coefficient, and hydrodynamic
radius of molecules are derived. For the mentioned polymer-solvent system, the mean hydrodynamic invariant is estimated as
A
0 = (3.4 ± 0.1) × 10−15 kg m2/(s2 deg mol1/3). The equilibrium thermodynamic rigidity of modified chitosan chains is found to be 20 ± 2 nm. This value, like the parameters
of the scaling relationships, suggests that the chitosan derivative under investigation belongs to the class of rigid-chain
polymers. It is shown that, in the selected mixed solvent, the molecules of the modified chitosan are more compact than molecules
of its nonmodified analog having close degrees of polymerization. |
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