Schwalm, Thorsten ; Rehahn, Matthias (2008)
Gel Formation during the Gilch Synthesis of Poly(p-phenylene vinylenes): Evidence of an Unexpected Explanation.
In: Macromolecular Rapid Communications, 29 (1)
doi: 10.1002/marc.200700439
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Gelation of the reaction mixture and insolubility of the poly(p-phenylene vinylenes) (PPVs) when isolated at this stage, but complete redissolution of the gel and excellent solubility of the resulting PPVs after further stirring for hours or days, is a phenomenon in Gilch polymerizations that has not been explained so far. It is verified that, in agreement with the literature, specific additives prevent gelation. However, it is also shown that chemical crosslinking is certainly not the reason for gel formation. Instead, it seems to be the consequence of a very high entanglement density in the pristine PPVs, which requires time for relaxation. The mentioned additives seem to support this dis-entanglement process.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2008 |
| Autor(en): | Schwalm, Thorsten ; Rehahn, Matthias |
| Art des Eintrags: | Bibliographie |
| Titel: | Gel Formation during the Gilch Synthesis of Poly(p-phenylene vinylenes): Evidence of an Unexpected Explanation |
| Sprache: | Englisch |
| Publikationsjahr: | Januar 2008 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Macromolecular Rapid Communications |
| Jahrgang/Volume einer Zeitschrift: | 29 |
| (Heft-)Nummer: | 1 |
| DOI: | 10.1002/marc.200700439 |
| Kurzbeschreibung (Abstract): | Gelation of the reaction mixture and insolubility of the poly(p-phenylene vinylenes) (PPVs) when isolated at this stage, but complete redissolution of the gel and excellent solubility of the resulting PPVs after further stirring for hours or days, is a phenomenon in Gilch polymerizations that has not been explained so far. It is verified that, in agreement with the literature, specific additives prevent gelation. However, it is also shown that chemical crosslinking is certainly not the reason for gel formation. Instead, it seems to be the consequence of a very high entanglement density in the pristine PPVs, which requires time for relaxation. The mentioned additives seem to support this dis-entanglement process. |
| Freie Schlagworte: | conducting polymers; cross-linking; gelation; Gilch reaction; entanglement; light-emitting diodes (LEDs); poly(p-phenylene vinylenes) (PPV) |
| 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 14:55 |
| Letzte Änderung: | 05 Mär 2013 09:51 |
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