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Copolymers obtained by grafting polyacrylamide (PAA) onto dextran (DEX) have been synthesised by ceric-ion-reduced redox initiation method. These copolymers have been characterized by light scattering and self-exclusion chromatography. Viscometry measurements in mixed solvents, water/dimethyl formamide (DMF) have revealed an anomalous behaviour reminiscent of a polyelectrolyte behaviour, namely a...