This study investigates the efficiency of a novel trifunctional alkoxyamine ( 1 ) based on N - tert -butyl-1-diethylphosphono-2,2-dimethylpropyl nitroxide (SG1) ( 2 ) as initiator for the controlled radical polymerization of styrene (S) and n -butyl acrylate ( n BuA). Three factors, namely the concentration of SG1 initially introduced in excess, the monomer conversion, and in the specific case of PS samples the monomer autopolymerization, were found to control the quality of the star samples obtained. Well-defined T-(PBuA- b -PS) 3 star block copolymers could also be synthesized by sequential copolymerization using the same trifunctional initiator.
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Robin et al. (2002) studied this question.
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