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Issue 15, 2017

The influence of branching on the Kumada catalyst transfer condensative polymerization of 3-alkylthiophenes

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Abstract

To study the influence of branching of the side chain on the Kumada catalyst transfer condensative polymerization (KCTCP) of 3-alkylthiophenes, first, a new, severely branched precursor monomer, 2-bromo-5-iodo-3-(2-octyldodecyl)thiophene, was designed. The controlled character of its polymerization was investigated and rate studies for both poly(3-hexylthiophene) (P3HT) and poly(3-(2-octyldodecyl)thiophene) (P3ODT) were performed. Second, the influence of non-covalent gelation on the controlled character of the polymerization was studied through the determination of the maximal degree of polymerization that could be obtained in a controlled manner. Third, nona-stage polymers were synthesized and the lifetime of the active chain ends for P3HT and P3ODT was studied. Last, the nature of the occurring termination reactions was established. Altogether, these results point out the difference in polymerization behavior between branched and linear alkyl substituents and, related to this, between gelated and non-gelated polymerization mixtures.

Graphical abstract: The influence of branching on the Kumada catalyst transfer condensative polymerization of 3-alkylthiophenes

Supplementary files

Article information


Submitted
15 Feb 2017
Accepted
22 Mar 2017
First published
22 Mar 2017

Polym. Chem., 2017,8, 2327-2333
Article type
Paper

The influence of branching on the Kumada catalyst transfer condensative polymerization of 3-alkylthiophenes

L. Verheyen, B. Timmermans and G. Koeckelberghs, Polym. Chem., 2017, 8, 2327 DOI: 10.1039/C7PY00255F

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