Synthesis of Branched Methacrylic Copolymers: Comparison between RAFT and ATRP and Effect of Varying the Monomer Concentration
| Autor: | Steven P. Armes, Julien Rosselgong, David L. Price, William R.S. Barton |
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| Rok vydání: | 2010 |
| Předmět: |
Polymers and Plastics
Chemistry Atom-transfer radical-polymerization Organic Chemistry Chain transfer Degree of polymerization Branching (polymer chemistry) Inorganic Chemistry Living free-radical polymerization chemistry.chemical_compound Polymerization Polymer chemistry Materials Chemistry Reversible addition−fragmentation chain-transfer polymerization Methyl methacrylate |
| Zdroj: | Macromolecules. 43:2145-2156 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | The statistical copolymerization of methyl methacrylate (MMA) with varying amounts of a disulfide-based dimethacrylate (DSDMA) branching comonomer in toluene at 90 °C can lead to highly branched soluble methacrylic copolymers under appropriate conditions. This model system is utilized in order to examine the following points: (i) the relative merits of using reversible addition−fragmentation chain transfer (RAFT) polymerization and atom transfer radical polymerization (ATRP) in such syntheses; (ii) the effect of varying the number of DSDMA units per primary chain; (iii) the effect of varying the initial monomer concentration. Kinetic studies of the linear RAFT and ATRP homopolymerizations conducted in the absence of any DSDMA confirmed their living character at 10, 30, and 50 wt % [MMA]0, where the former monomer concentration approximately corresponds to the critical overlap concentration, c*, for linear poly(methyl methacrylate) (PMMA) chains with a mean degree of polymerization of 50. HPLC analysis of ... |
| Databáze: | OpenAIRE |
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