Polymerizable oil-in-oil emulsions: poly(vinyl pyrrolidone) dispersions in reactive PDMS medium
| Autor: | Samer Al Akhrass, Christelle Delaite, Patrick Moireau, Kamal Hariri, Gérard Riess |
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| Rok vydání: | 2007 |
| Předmět: |
Dispersion polymerization
Materials science Telechelic polymer Polymers and Plastics Organic Chemistry Radical polymerization technology industry and agriculture Cationic polymerization Emulsion polymerization macromolecular substances Polymerization Polymer chemistry Emulsion Materials Chemistry Copolymer |
| Zdroj: | Polymer International. 56:1200-1205 |
| ISSN: | 1097-0126 0959-8103 |
| Popis: | The system N-vinyl-2-pyrrolidone (VP)/polydimethylsiloxane diglycidylether (PDMS-DGE) is a typical example of an oil-in-oil emulsion formed by two non-miscible liquids, where both phases are polymerizable in a ‘one-pot’ procedure by two distinct reaction mechanisms. These oil-in-oil emulsions were characterized by their stability and by the particle size of the dispersed VP phase. Non-aqueous dispersions (NADs) are obtained in a first step by free radical polymerization of the dispersed VP phase. The reaction kinetics, studied as a function of the initiator type and concentration, show that the polymerization rate is mainly influenced by the partition coefficient of the initiator between both phases. The NAD particle size could be tailored from a micrometer to a nanometer range by in situ formation of PVP-PDMS graft copolymer. Hydrophilic–hydrophobic two-phase materials can be obtained by polycondensation, in the presence of polyamines, of the epoxy-functionalized PDMS continuous NAD phase. Copyright © 2007 Society of Chemical Industry |
| Databáze: | OpenAIRE |
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