Abstract
The poly(vinyl alcohol)–iodine blue color reaction in dilute aqueous solution was investigated at 6–8°C and extinctions at the absorption maximum were measured as a function of the 1,2-glycol content and stereoregularity of poly(vinyl alcohol) (PVA). Increase in the 1,2-glycol content and in the isotacticity caused remarkable decrease in the color intensity. In particular, the reaction mixture was almost colorless when the 1,2-glycol content exceeded 5 mol% or the isotacticity was more than 70%. Wave length of the absorption maximum of the reaction mixture was not affected by the 1,2-glycol content (608 mμ), whereas the maximum was shifted to a shorter wave length with an increase of isotacticity. It is suggested that the 1,2-glycol structure simply decreases the content of the PVA–iodine complex. The sequence length of 1,3-glycol units required for the color reaction of atactic PVA was estimated to be about 120. The isotactic structure, on the other hand, may not only disturb the formation of the complexes, but may also affect their structure.
Similar content being viewed by others
Log in or create a free account to read this content
Gain free access to this article, as well as selected content from this journal and more on nature.com
or
References
M. Sumi, K. Matsumura, R. Ohno, S. Nozakura, and S. Murahashi, Kobunshi Kagaku (Chem. High Polymers), 24, 606 (1967).
S. Murahashi, S. Nozakura, and K. Matsumura, J. Polym. Sci., Part B, 4, 59 (1966).
K. Kikukawa, S. Nozakura, and S. Murahashi, Kobunshi Kagaku (Chem. High Polymers), 24, 811 (1967).
K. Imai and M. Matsumoto, J. Polym. Sci., 55, 335 (1961).
K. Shibatani, M. Nakamura, and Y. Oyanagi, Kobunshi Kagaku (Chem. High Polymers), 26, 118 (1969).
K. Kikukawa, S. Nozakura, and S. Murahashi, Kobunshi Kagaku (Chem. High Polymers), 25, 19 (1968).
H. E. Harris and J. G. Pritchard, J. Polym. Sci., Part A, 2, 3673 (1964).
S. Murahashi, S. Nozakura, M. Sumi, H. Yuki, and K. Hatada, J. Polym. Sci., Part B, 4, 65 (1966).
S. Murahashi, S. Nozakura, M. Sumi, H. Yuki, and K. Hatada, Kobunshi Kagaku (Chem. High Polymers), 23, 605 (1966).
S. Murahashi, H. Yuki, T. Sano, U. Yonemura, H. Tadokoro, and Y. Chatani, J. Polym. Sci., 62, 577 (1962).
H. Murakami, J. Chem. Phys., 22, 367 (1954).
M. M. Zwick, J. Appl. Polym. Sci., 9, 2393 (1965).
F. R. Senti and S. R. Erlander, “Nonstoichiometric Compounds,” L. Mandelkern Ed., Academic Press, New York, N.Y., 1964, p 568.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kikukawa, K., Nozakura, Si. & Murahashi, S. Effect of 1,2-Glycol Structure and Stereoregularity of Poly(vinyl alcohol) on Poly(vinyl alcohol)–Iodine Reactions. Polym J 2, 212–219 (1971). https://doi.org/10.1295/polymj.2.212
Issue date:
DOI: https://doi.org/10.1295/polymj.2.212
