International audienceChitosan (CS) was modified by SG1-based nitroxide-mediated polymerization under heterogeneous conditions. After introduction of acrylamide and/or acrylate functions onto the CS backbone followed by intermolecular 1,2 radical addition of the BlocBuilder alkoxyamine (CS–BB), methyl methacrylate (MMA) in the presence of a small amount of acrylonitrile (AN) or sodium 4-styrenesulfonate (SS) was polymerized by nitroxide-mediated polymerization (NMP). ESR and free-solution capillary electrophoresis confirmed the synthesis of CS–BB. The successful synthesis of CS-g-P(MMA-co-AN) and CS-g-PSS grafted copolymers was proved by TGA and solid-state NMR spectroscopy with ca. 20 to 30 wt% of grafted synthetic polymer in the final product
Cellulose acetate-g-polystyrene (CA-g-PS) grafted copolymers have been synthesized by nitroxidemediated\ud
polymerization (NMP) under homogeneous conditions by using the 1,2-intermolecular radical\ud
addition (1,2-IRA) methodology to introduce the SG1-based alkoxyamine BlocBuilder MA (BB) on the\ud
polysaccharide backbone. A preliminary study conducted on model sugar-based alkoxyamines proved that\ud
whatever the position of the alkoxyamine on the sugar unit, the number of sugar units and the presence\ud
of OH groups, one could expect a controlled/living polymerization process. This was confirmed by the\ud
graft polymerization of styrene from the BB-modified cellulose acetate backbone with two different grafting\ud
ratios (3 and 20%) and different grafted chain lengths (40 000 and 80 000 g mol−1 targeted Mn). The\ud
grafted copolymers were carefully analyzed, in particular, by DOSY NMR to confirm their grafted\ud
structure
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