A Novel Macroinitiator for the Synthesis of Triblock Copolymers via Atom Transfer Radical Polymerization: Polystyrene-block-poly(bisphenol A carbonate)-block-polystyrene and Poly(methyl methacrylate)-block-poly(bisphenol A carbonate)-block-poly(methyl methacrylate)
| Autor: | René Nagelsdiek, Martina Mennicken, Helmut Keul, Hartwig Höcker |
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| Rok vydání: | 2004 |
| Předmět: |
Polymers and Plastics
Atom-transfer radical-polymerization Organic Chemistry Solution polymerization Condensed Matter Physics Poly(methyl methacrylate) End-group chemistry.chemical_compound chemistry Polymerization Diphenyl carbonate visual_art Polymer chemistry Materials Chemistry Copolymer visual_art.visual_art_medium Physical and Theoretical Chemistry Methyl methacrylate |
| Zdroj: | Macromolecular Chemistry and Physics. 205:143-153 |
| ISSN: | 1521-3935 1022-1352 |
| Popis: | Bis(hydroxy)telechic bisphenol A polycarbonate (PC) was prepared via melt polycondensation of bisphenol A (BPA) and diphenyl carbonate (DPC) using lanthanum(m) acetylacetonate as a catalyst for transesterification. Subsequently, the polycarbonate was converted to a bifunctional macroinitiator for atom transfer radical polymerization (ATRP) with the reagent, α-chlorophenylacetyl chloride. The macroinitiator was used for the polymerization of styrene (S) and methyl methacrylate (MMA) to give PS-block-PS and PMMA-block-PC-block-PMMA triblock copolymers. These block copolymers were characterized by NMR and GPC. When styrene and methyl methacrylate were used in large excess, significant shifts toward high molecular weights were observed with quantitative consumption of the macroinitiator. Several ligands were studied in combination with CuCl as the ATRP catalyst. Kinetic studies reveal the controlled nature of the polymerization reaction for all the ligands used. |
| Databáze: | OpenAIRE |
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