Nitroxide-Mediated Polymerization of Vinyl Chloride at Low Temperature: Kinetic and Computational Studies
| Autor: | Julien Nicolas, Patrícia V. Mendonça, Arménio C. Serra, Carlos M. R. Abreu, Michelle L. Coote, Benjamin B. Noble, Tamaz Guliashvili, Jorge F. J. Coelho |
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| Rok vydání: | 2016 |
| Předmět: |
Nitroxide mediated radical polymerization
Polymers and Plastics Organic Chemistry 02 engineering and technology Nuclear magnetic resonance spectroscopy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Vinyl chloride 0104 chemical sciences Inorganic Chemistry Solvent chemistry.chemical_compound Monomer Polymerization chemistry Polymer chemistry Materials Chemistry Proton NMR Methyl methacrylate 0210 nano-technology |
| Zdroj: | Macromolecules. 49:490-498 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | The synthesis of poly(vinyl chloride) (PVC) by nitroxide-mediated polymerization (NMP) using the SG1-based BlocBuilder alkoxyamine at low temperature (30 and 42 °C) is reported. The reaction system was studied regarding the nature of the solvent, the monomer-to-solvent ratio, the polymerization temperature, and the target molecular weight. First-order kinetics and linear evolutions of the molecular weight with vinyl chloride (VC) conversion were obtained in dichloromethane (DCM) and dimethyl sulfoxide (DMSO) together with decreasing dispersities (Đ) down to 1.59–1.47. The resulting PVC was fully characterized by 1H nuclear magnetic resonance spectroscopy (1H NMR), 31P NMR, and size exclusion chromatography (SEC). The 1H NMR and 31P NMR revealed the existence of very small content of structural defects and the presence of chain-end functional groups (∼91% SG1 chain-end functionality). Chain extension experiments were performed with VC, methyl methacrylate (MMA), and a mixture of monomers (90% of MMA and 10... |
| Databáze: | OpenAIRE |
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