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Proceedings Paper

Block-type architectures for poly(p-Phenylene Vinylene) derivatives: a reality or an illusion?
Author(s): Dirk J. M. Vanderzande; Lieve Hontis; Arne Palmaerts; David Van Den Berghe; Jimmy Wouters; Laurence Lutsen; Thomas Cleij
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Paper Abstract

Poly(p-Phenylene Vinylene) derivatives are synthesized mostly making use of the polymerization behavior of p-quinodimethane systems. Over the last forty years different synthetic routes have been developed, e.g. Wessling, Gilch, Xanthate and Sulphinyl route. For all these routes mechanistic studies are rather scarce and lead to a controversy between two possible mechanisms: anionic and radical polymerization. In this contribution it becomes clear that high molecular weight materials are associated with a self-initiated radical chain polymerization and low molecular weight materials are obtained via an anionic mechanism. This will be demonstrated for the model system in which a sulphinyl pre-monomer is polymerized in N-Methyl-Pyrrolidone. In this model system both these mechanisms are competing with each other. The observed effects on the product distribution of concentration of reagents, temperature and order in which the reagents are added, are consistent with the conclusion above. The question whether living polymerization can occur will be addressed for the radical mechanism. An experiment with a set of sequential polymerizations gives rise to an evolution of molecular weight consistent with the effect of simple dilution of the reaction medium. The conclusion is that a termination reaction is active, which can be identified as related to traces of oxygen. In these conditions the synthesis of block-type copolymers can not be achieved. For the anionic mechanism an argumentation against such possibility will be presented on the basis of relative acidities.

Paper Details

Date Published: 9 October 2005
PDF: 10 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 59370Q (9 October 2005); doi: 10.1117/12.624135
Show Author Affiliations
Dirk J. M. Vanderzande, Univ. Hasselt (Belgium)
IMEC (Belgium)
Lieve Hontis, Univ. Hasselt (Belgium)
Arne Palmaerts, Univ. Hasselt (Belgium)
David Van Den Berghe, Univ. Hasselt (Belgium)
Jimmy Wouters, IMEC (Belgium)
Laurence Lutsen, IMEC (Belgium)
Thomas Cleij, Univ. Hasselt (Belgium)

Published in SPIE Proceedings Vol. 5937:
Organic Light-Emitting Materials and Devices IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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