Adsorption of cationic polymers on the surfaces of anionic glass microspheres |
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Authors: | A S Malinin I V Kalashnikova A A Rakhnyanskaya A A Yaroslavov |
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Institution: | 1.Faculty of Chemistry,Moscow State University,Moscow,Russia |
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Abstract: | The adsorption of cationic copolymers prepared by the quaternization of poly(4-vinylpyridine) with bromoacetic acid and/or
ethyl bromide on the surface of anionic glass microspheres and the stability of the as-prepared complexes against dissociation
in water-salt solutions are studied. Experiments are performed with the use of two types of copolymers: copolymers carrying
cationic and hydrophobic units and copolymers carrying cationic and zwitterionic (electroneutral) units in main chains. For
hydrophobic copolymers, the limiting adsorption decreases as the molar fraction of cationic groups in the copolymer, α, increases.
In the case of hydrophilic copolymers, the dependence of limiting adsorption on α has a bellshaped pattern with a maximum
at α = 0.15 and a horizontal segment at α > 0.4. Hydrophobic copolymers feature irreversible binding with microspheres at
α > 0.24; hydrophilic copolymers, at α ≥ 0.15. The obtained data may be used for creation of biocidal polymer coatings and
sorption layers that reversibly desorb from the surface with a change in the salt concentration in the surrounding aqueous
solution. |
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