| Popis: |
Styrylpyridinium substituted vinyl polymers (6), which are in effect polymeric dyes, may easily be prepared by condensing poly[1-(1,6-dimethylpyridinium-3-yl)ethylene methyl sulfate] (3) with various aromatic aldehydes (5) using piperidine as catalyst. The preparation of 40 of these polymers prepared from 39 different aldehydes or combinations of them is reported. The spectral data show that they may be designed for maximum absorption almost anywhere from 270–540 nm and with a great variation in photosensitivity and solubility. It is possible to prepare the vinyl substituted styrylpyridinium salts and then polymerize them, or to prepare the styrylpyridine substituted vinyl polymer and then quaternize it, but the preferred method is to prepare the quaternized polymer 3 and then condense it with an aromatic aldehyde 5 to form the styrylpyridinium substituted vinyl polymer 6. These polymers do not require spectral sensitization and, in fact, we found no compounds that act as sensitizers. |
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