Molecular weight tuning and spectral studies of novel CN‐PPVs via Gilch reaction route

Two novel cyano-containing PPVs (CN-PPVs) with different solubilizing alkyloxyl groups were synthesized through Gilch reaction from the monomer 2-cyano-5-(4′-alkoxyphenyl)-1,4-bisbromomethylbenzene. The structures of the polymers were determined by NMR, FTIR, and elemental analysis (EA). The results show that the solubility, thermal stability, and fluorescence properties of CN-PPVs vary with differing molecular weight. The relationship between the molecular weight of the polymers and the amount of 4-methoxyphenol used was consistent with anionic polymerization, of which the molecular weight is known to be inversely related to the amount of the initiator. When the number-average molecular weight (Mn) is in the range of 30,000–100,000, the solubility of the polymers was very good in chloroform, tetrahydrofuran, and toluene, and have good film properties. The fluorescence emission maxima range from 457 to 520 nm, exhibiting appreciable red-shift with the increase of the molecular weight. This series of novel CN-PPVs also bear high thermal stability. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007

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