Schwalm, Thorsten and Rehahn, Matthias (2008):
Efficient Oxygen-Induced Molar-Mass Control of Poly(p-phenylene vinylenes) Synthesized via the Gilch Route.
29, In: Macromolecular Rapid Communications, (3), pp. 207-213, ISSN 10221336, [Online-Edition: http://dx.doi.org/10.1002/marc.200700609],
[Article]
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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2008 |
| Creators: | Schwalm, Thorsten and Rehahn, Matthias |
| Title: | Efficient Oxygen-Induced Molar-Mass Control of Poly(p-phenylene vinylenes) Synthesized via the Gilch Route |
| Language: | English |
| 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. |
| Journal or Publication Title: | Macromolecular Rapid Communications |
| Volume: | 29 |
| Number: | 3 |
| Uncontrolled Keywords: | conducting polymers; gilch reaction; light-emitting diodes (LED); molar-mass regulation; poly(p-phenylene vinylenes) (PPV); polyrecombination; radical polymerization |
| Divisions: | DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A5: Synthesis of semiconducting model polymers and their characterization before and after cyclic electrical fatigue DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue Zentrale Einrichtungen DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres DFG-Collaborative Research Centres (incl. Transregio) |
| Date Deposited: | 04 Aug 2011 14:47 |
| Official URL: | http://dx.doi.org/10.1002/marc.200700609 |
| Additional Information: | SFB 595 A5 |
| Identification Number: | doi:10.1002/marc.200700609 |
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