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Free radical two step synthesis of styrene and acrylate block copolymers with disulphide initiators
Opresnik, Marko ; Šebenik, Anton, 1941-
Controlled two step block copolymerization of styrene, methyl methacrylate and ethyl acrylate with aliphatic and aromatic disulphides under UV irradiation took place in bulk and in THF solution. In ...the first step of the polymerization, the most reactive system was ethyl acrylate with aromatic disulphides. The molecular weights and yields of polymerizations increased with reaction time. The macromolecules were teminated by primary . SR radicalsand by combination of two macroradicals which was observed by NMR spectroscopy. An insignificant portion of uninitiated photopolymerization was detected only for MMA. In the second step of polymerization, the purified macroinitators from the first step reacted with additional monomers to form block copolymers with a small quantity of unreacted macroinitiator. The molecular weights of copolymers increased, the bonding segments between the blocks being detected by ^1H NMR. The overall reaction is an insertion of monomers between two thiyl groups.
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