Sorption of anionic amphiphilic block copolymers by a network polycation |
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Authors: | O A Novoskol’tseva V D Astakhova E V Chernikova V B Rogacheva A B Zezin |
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Institution: | 1.Faculty of Chemistry,Moscow State University,Moscow,Russia |
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Abstract: | The interaction of amphiphilic block copolymers comprising an anionic block (polyacrylate or polymethacrylate) and a hydrophobic
block (polystyrene, poly(butyl acrylate) or polyisobutylene) with lightly crosslinked poly(N,N-diallyl-N,N-dimethylammonium chloride) is studied for the first time. It is shown that the cationic hydrogel can sorb anionic amphiphilic
block copolymers via electrostatic interaction with the corona of block copolymer micelles. The rate of sorption of block
copolymer polyelectrolytes is significantly lower than the rate of sorption of linear polyions and is controlled by the lengths
of the hydrophilic and hydrophobic blocks and the flexibility of the latter blocks. The sorption of amphiphilic block copolymers
is accompanied by their self-assembly in the polycomplex gel and formation of a continuous hydrophobic layer impermeable to
water and the low-molecular-mass salt dissolved in it. |
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