Surface-initiated atom transfer radical polymerization of methyl methacrylate on magnetite nanoparticles
| Autor: | Takeshi Fukuda, Yoshinobu Tsujii, Tsedev Ninjbadgar, Shinpei Yamamoto, Mikio Takano, Eizo Marutani |
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| Rok vydání: | 2004 |
| Předmět: |
Materials science
Polymers and Plastics Atom-transfer radical-polymerization Organic Chemistry Dispersity Radical polymerization magnetic nanoparticle atom transfer radical polymerization graft polymerization End-group chemistry.chemical_compound Monomer chemistry Graft polymer Polymerization Polymer chemistry Materials Chemistry Precipitation polymerization |
| Zdroj: | Polymer. 45:2231-2235 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2004.02.005 |
| Popis: | The synthesis of magnetite nanoparticles coated with a well-defined graft polymer is reported. The magnetite nanoparticles with an initiator group for copper-mediated atom transfer radical polymerization (ATRP), 2-(4-chlorosulfonylphenyl) ethyltrichlorosilane (CTCS) chemically bound on their surfaces were prepared by the self-assembled monolayer-deposition method. The surface-initiated ATRP of methyl methacrylate (MMA) was carried out with the CTCS-coated magnetite nanoparticles in the presence of free (sacrificing) initiator, p-toluenesulfonyl chloride. Polymerization proceeded in a living fashion, exhibiting first-order kinetics of monomer consumption and a proportional relationship between molecular weight of the graft polymer and monomer conversion, thus providing well-defined, low-polydispersity graft polymers with an approximate graft density of 0.7 chains/nm2. The molecular weight and polydispersity of the graft polymer were nearly equal to those of the free polymer produced in the solution, meaning that the free polymer is a good measure of the characteristics of the graft polymer. The graft polymer possessed exceptionally high stability and remarkably improved dispersibility of the magnetite nanoparticles in organic solvent. |
| Databáze: | OpenAIRE |
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