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The behavior of Poly-2-vinylpyridine in aqueous solution as a function of neutralization with hydrochloric acid has been investigated by infrared and Raman spectroscopy. Ethylpyridine and pyridine were utilized as model compounds. The results indicate that between 0.0 and 0.5 neutralization the polymer is progressively solvated and extended. The Raman spectra indicate that a conformational transition is occuring in the polymer at 0.5 neutralization. A region of the Raman spectrum was found to be insensitive to neutralization but strongly dependent on stereoregularity.
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Puterman et al. (1979) studied this question.
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