Triblock copolymers were prepared under 60Co γ-irradiation in the presence of a trithiocarbonate macroinitiator. The triblock copolymers, PSt-PMA-PSt and PMA-PSt-PMA have well-defined structures, controlled molecular weight and narrow molecular weight distribution. The mechanism of block copolymerization is discussed.
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You et al. (2001) studied this question.