Branched Dextran-graft-Polyacrylamide Copolymers as Perspective Materials for Nanotechnology

摘要

Branched dextran-graft-polyacrylamide copolymers (D-g-PAAn) with differentnumber of PAA-grafts have been synthesized for further conversion them topolyelectrolytes dextran-graft-(polyacrylamide-co-polyacrylic acid). It is shown thatD-g-PAAn internal structure in water solution is more compact in comparison withlinear polyacrylamide and depends upon the distance between PAA grafts.The branched polyelectrolytes are obtained by alkaline hydrolysis of synthesizedD-g-PAAn samples. The conversion of nonionic polymers to partial anionic formdepends upon the macromolecular internal structure of D-g-PAAn. The degreeof transformation of amide groups to carboxylate ones is higher for branchedcopolymers than for linear PAA at the same condition. The synthesized branchedcopolymers are shown to be perspective as flocculation agents and the matricesfor synthesis of the stable Ag nanosystems.