TU Darmstadt / ULB / TUbiblio

Gel Formation during the Gilch Synthesis of Poly(p-phenylene vinylenes): Evidence of an Unexpected Explanation

Schwalm, Thorsten and Rehahn, Matthias (2008):
Gel Formation during the Gilch Synthesis of Poly(p-phenylene vinylenes): Evidence of an Unexpected Explanation.
In: Macromolecular Rapid Communications, pp. 33-38, 29, (1), ISSN 10221336, [Online-Edition: http://dx.doi.org/10.1002/marc.200700439],
[Article]

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.

Item Type: Article
Erschienen: 2008
Creators: Schwalm, Thorsten and Rehahn, Matthias
Title: Gel Formation during the Gilch Synthesis of Poly(p-phenylene vinylenes): Evidence of an Unexpected Explanation
Language: English
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.

Journal or Publication Title: Macromolecular Rapid Communications
Volume: 29
Number: 1
Uncontrolled Keywords: conducting polymers; cross-linking; gelation; Gilch reaction; entanglement; light-emitting diodes (LEDs); poly(p-phenylene vinylenes) (PPV)
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 14:55
Official URL: http://dx.doi.org/10.1002/marc.200700439
Additional Information:

SFB 595 A5

Identification Number: doi:10.1002/marc.200700439
Export:

Optionen (nur für Redakteure)

View Item View Item