The color reaction between partially saponified poly(vinyl acetate) and iodine-iodide in the presence of boric acid

The effect of the boric acid concentration on the color reaction between partially saponified poly(vinyl acetate), which is dissolvable in water, and iodine‐iodide was investigated. As the concentration of boric acid increased, the absorbance at λmax = 488 nm of the red‐violet complex, which is due...

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Bibliographic Details
Published in:Die Makromolekulare Chemie 1977-06, Vol.178 (6), p.1679-1687
Main Authors: Hayashi, Sadao, Tanabe, Youichi, Hojo, Nobumasa
Format: Article
Language:English
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Summary:The effect of the boric acid concentration on the color reaction between partially saponified poly(vinyl acetate), which is dissolvable in water, and iodine‐iodide was investigated. As the concentration of boric acid increased, the absorbance at λmax = 488 nm of the red‐violet complex, which is due to a long sequence of vinyl acetate units distributed along the polymer chain, increased gradually, reached a maximum, and then decreased from the point in which the absorbance at λmax = 656nm of the blue complex, based on the vinyl alcohol units in the polymer, was observed. The color complex in an excess of boric acid transferred from red‐violet to red‐tinged blue with time. From the color change, the molar absorption coefficient at λmax = 656 nm for the iodine molecule in the blue complex was found to be 3,92.104l/(mol cm).
ISSN:0025-116X
0025-116X
DOI:10.1002/macp.1977.021780608