Trithioperesters (Z-C(=S)S-SR) were used as control agents  in polymerizations carried out in absence of free radical initiator at T=110 �C.  In the case of styrene, narrow polymers (� = 1.1) were obtained which were excellent precursors of block copolymers prepared through RAFT polymerization initiated with AIBN. Trithiocarbonates (R-SC(=S)S-R) were also used in thermal polymerizations of methacrylic monomers yielding polymers with � = 1.4 but, a complicated behavior was encountered. In this case the experimental molecular weight differs from that estimated (Mnth) from the molar ratio [M]/[R-SC(=S)S-R]. Nevertheless, some block copolymers were successfully prepared. The alternated use of thermal and RAFT polymerizations was explored as a new pathway to form multiblock copolymers

Trithioperesters and trithiocarbonates as control agents in RDRP initiated thermally

248th National Meeting (2014)

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