Schwalm, Thorsten ; Rehahn, Matthias (2008)
Efficient Oxygen-Induced Molar-Mass Control of Poly(p-phenylene vinylenes) Synthesized via the Gilch Route.
In: Macromolecular Rapid Communications, 29 (3)
doi: 10.1002/marc.200700609
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Oxygen is shown to act as an efficient molar-mass regulating agent in Gilch syntheses of PPV. As a scavenger, it undergoes instantaneous recombination with the initiating diradicals as soon as they appear in the system. Regular polymer formation can only start when all oxygen has been used, proceeding predominantly as chain-growth polymerization of the p-quinodimethane monomers. Since all radical species involved in this Gilch process are diradicals, some polyrecombination events occur in parallel. Therefore the initially formed peroxy diradicals are also incorporated into the resulting chains. Later, they break under very mild conditions, thereby causing a systematic decrease of the final molar mass of PPV.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2008 |
| Autor(en): | Schwalm, Thorsten ; Rehahn, Matthias |
| Art des Eintrags: | Bibliographie |
| Titel: | Efficient Oxygen-Induced Molar-Mass Control of Poly(p-phenylene vinylenes) Synthesized via the Gilch Route |
| Sprache: | Englisch |
| Publikationsjahr: | Februar 2008 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Macromolecular Rapid Communications |
| Jahrgang/Volume einer Zeitschrift: | 29 |
| (Heft-)Nummer: | 3 |
| DOI: | 10.1002/marc.200700609 |
| Kurzbeschreibung (Abstract): | Oxygen is shown to act as an efficient molar-mass regulating agent in Gilch syntheses of PPV. As a scavenger, it undergoes instantaneous recombination with the initiating diradicals as soon as they appear in the system. Regular polymer formation can only start when all oxygen has been used, proceeding predominantly as chain-growth polymerization of the p-quinodimethane monomers. Since all radical species involved in this Gilch process are diradicals, some polyrecombination events occur in parallel. Therefore the initially formed peroxy diradicals are also incorporated into the resulting chains. Later, they break under very mild conditions, thereby causing a systematic decrease of the final molar mass of PPV. |
| Freie Schlagworte: | conducting polymers; gilch reaction; light-emitting diodes (LED); molar-mass regulation; poly(p-phenylene vinylenes) (PPV); polyrecombination; radical polymerization |
| Zusätzliche Informationen: | SFB 595 A5 |
| Fachbereich(e)/-gebiet(e): | DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese > Teilprojekt A5: Synthese halbleitender Modellpolymere und deren Charakterisierung vor und nach zyklischer elektrischer Ermüdung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) |
| Hinterlegungsdatum: | 04 Aug 2011 14:47 |
| Letzte Änderung: | 05 Mär 2013 09:51 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum