Block Polymerizations of Vinyl Monomers Initiated by Telechelicisopropyl Xanthate-Terminated Polymers as Macrophotoinitiator. Design Of Block Copolymers. 2

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Abstract
Both photopolymerization and thermal polymerization of a variety of vinyl monomers with bis(isopropylxanthogen) disulfide (BX) as initiator and as chain-transfer agent were carried out in benzene. The results of photopolymerizations to high conversion with BX support the polymerization mechanism given in a previous paper of this series. Telechelic isopropyl xanthate-terminated polymers (TXP) having a different backbone have been used as macroinitiator for the polymerization of vinyl monomers. The rate of polymerization of the functional polymers was found to be markedly dependent on the monomer species: block polymerization of methyl acrylate or methyl methacrylate proceeded rapidly compared to the chain-extension polymerization of styrene. However, in all cases the molecular weight of the polymers obtained was found to increase linearly with conversion, which is an interesting property for the design of block copolymers and which is similar in polymerization with BX. It is also found that the molecular weight of the block copolymers can be controlled by adjusting the concentration of the TXP macroinitiator.

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