原子移動ラジカル重合によるセルロース系グラフト共重合体の合成

抄録

Atom transfer radical polymerization (ATRP) of styrene and methyl methacrylate (MMA) was carried out using chloroacetyl cellulose and cellulose acetate (CA) as an initiator in glyme. ATRP was also done using 2-chloropropionyl cellulose and CA. The cellulosic graft copolymers were prepared through the activation of initiators by the metal complex consisted of CuBr and pentamethyldiethylenetriamine (PMDATA). Increase in the degree of substitution (DS) of chloroacyl groups led to increase in grafting ratio. Grafting efficiency was over 80 % with both monomers. 2-chloropropionyl cellulose and CA revealed higher reactivity than chloroacetyl derivatives nevertheless their much lower DS of 2-chloropropionyl groups. Though styrene was not polymerized below 100°C by any initiators used, it became feasible to be polymerized at 80°C by mixing with MMA which was easily polymerized at this temperature. Copolymers of styrene and MMA was grafted in this case. CA-graft-PMMA copolymers having grafting ratio over 80 % were dissolved in acetone and dimethyl sulfoxide.