Synthesis and Characterization of a Catenated Polystyrene−Poly(2-vinylpyridine) Block Copolymer

Citations Over TimeTop 24% of 2002 papers

Abstract

The synthesis, isolation, and characterization are reported of a polystyrene−poly(2-vinylpyridine) block copolymer “catenane” with a molecular weight of about 10 000 and containing about equal masses of each of the rings. This catenane is prepared by end-to-end coupling of a P2VP dianion lithium salt with 1,4-bis(bromomethylbenzene) in THF in the presence of a PS macrocycle (Mp = 4500). The catenane was isolated by precipitation−extraction procedures that were optimized using a 50/50 PS-b-P2VP macrocycle as a model for the catenane. The catenane copolymer was characterized by SEC, 1H NMR, and emission (fluorescence) spectroscopy.

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