Catalyst-Transfer Polycondensation for the Synthesis of Poly(p-phenylene) with Controlled Molecular Weight and Low Polydispersity
- 22 November 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 128 (50), 16012-16013
- https://doi.org/10.1021/ja067107s
Abstract
To examine whether catalyst-transfer polycondensation, which affords well-defined polythiophenes, has generality for other conjugated polymers, the synthesis of poly(p-phenylene) (PPP) with various Ni catalysts was investigated. Monomer 1, 1-bromo-4-chloromagnesio-2,5-dihexyloxybenzene, was polymerized with Ni(dppe)Cl2 in the presence of equimolar LiCl to give PPP with a narrow polydispersity. The number-average molecular weight (Mn) of PPP thus obtained increased in proportion to the conversion of 1, indicating that this polymerization also proceeded in a chain-growth polymerization manner. Furthermore, the molecular weight of PPP was controlled by the feed ratio of 1 to the Ni catalyst up to at least Mn = 30000.Keywords
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