Abstract
A block copolymer of cellulose and polystyrene (PS) was synthesized through atom transfer radical polymerization. Macroinitiators (MIs) were prepared by introducing 2-chloroacetamide to the reducing end of cellulose (degree of polymerization=20, 50, 250). Subsequently, MIs were copolymerized with styrene monomer in a system of N,N,N′,N″,N″-pentamethyldiethylenetriamine/CuCl or CuBr/ascorbic acid at 130 °C. The resulting copolymers were characterized by 1H nuclear magnetic resonance and size-exclusion chromatography. The kinetic study indicated that the polymerization was controllable. The efficacy of copolymers in compatibilizing an immiscible cellulose/PS blend was confirmed by microscopic observation. The mechanism of thermal and thermo-oxidative decomposition of the blend was investigated by thermogravimetry. Block copolymerization of cellulose and styrene was carried out by ATRP. Macroinitiators were prepared from three types of cellulose (DP=20, 50, 250). The resulting copolymers were characterized by 1H NMR and SEC. The miscibility of the immiscible cellulose/PS blend was improved by the addition of block copolymer.
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