Quasiliving Carbocationic Polymerization. XIV. Synthesis of Poly(styrene-b-Isobutylene) |
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| Authors: | M Györ J P Kennedy T Kelen F Tüdüs |
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| Institution: | 1. Central Research Institute for Chemistry Hungarian Academy of Sciences , 1525, Budapest, Hungary;2. Institute of Polymer Science The University of Akron , Akron, Ohio, 44325;3. Institute of Polymer Science The University of Akron , Akron, Ohio, 44325 |
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| Abstract: | The synthesis of poly(styrene-b-isobutylenes) by the sequential addition of styrene and isobutylene has been accomplished. First a stream of styrene was added to a cumyl chloride/TiCl4 in nhexane/methylene chloride charge at -50°C under quasiliving conditions. After the polystyrene block has reached a desirable sequence-length (molecular weight), gaseous isobutylene was continuously introduced to the quasiliving polystyrene carbocation until the polyisobutylene block also reached a desirable molecular weight. The M n versus monomer input plot was uninterrupted and linear over both monomer introduction phases, indicating quasi-living conditions over the entire regime of block copolymer synthesis. The block copolymers have been characterized by selective solvent extraction and GPC, and their compositions determined by 1H-NMR spectroscopy. |
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