Photoinduced Synthesis of α,ω-Telechelic Sequence-Controlled Multiblock Copolymers
| Autor: | Alexandre Simula, Athina Anastasaki, Nicholas William McCaul, Kristian Kempe, David M. Haddleton, Paul Wilson, Christopher Waldron, Vasiliki Nikolaou, Jamie Godfrey |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Macromolecules. 48:1404-1411 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.5b00058 |
| Popis: | Photoinduced living radical polymerization has been employed to synthesize α,ω-telechelic multiblock copolymers of a range of acrylic monomers including methyl acrylate (MA), ethyl acrylate (EA), ethylene glycol methyl ether acrylate (EGA), and solketal acrylate (SA). Under carefully optimized conditions, a well-defined tricosablock (23 blocks) copolymer was obtained (Đ = 1.18) with high conversion (>98%) achieved throughout all the iterative monomer additions. Crucially, a reduced temperature (15 °C) was found to result in an observed decrease in the dispersities (1.14 vs 1.45) as opposed to when higher temperatures (50 °C) were employed. A number of bifunctional initiators were employed, including ethylene bis(2-bromoisobutyrate) (EbBiB), a PEG initiator (average Mw = 1000 g mol–1), and bis[2-(2′-bromoisobutyryloxy)ethyl] disulfide ((BiBOE)2S2), resulting in narrow dispersed multiblock copolymers in various molecular weights (DPn ∼ 2/13/50/100 per block). Impressively, a high molecular weight undecabloc... |
| Databáze: | OpenAIRE |
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