Color Reactions of Poly vinyl Acetate and Its Derivatives with Iodine

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概要

• 論文の詳細を見る

• It has been found that the addition of a methanol solution containing polyvinyl acetate (PVAc) and iodine to an aqueous solution of potassium iodide results in a red-violet color without precipitating any polymer. The absorption maximum was located at 510 mμ. The absorbance of the PVAc-iodine complex decreased only slightly with an increase in the degree of the polymerization of PVAc. A linear relationship was obtained between the abosrbance and the PVAc concentration. It was found from these results that the color reaction of PVAc with iodine can be used in a colorimetric determination of PVAc, which is insoluble in water. Further, an attempt was made to investigate the complex formation of the vinyl acetate-vinyl propionate copolymer (PVAc-PVPr) and the vinyl acetate-vinyl formacetal copolymer (PVAc-PVFA) with iodine. Although the absorption maximum of the color complex of PVAc-PVPr with iodine appeared at 510 mμ, independent of the copolymer composition, the absorbance decreased with an increase in the number of vinyl propionate units in the copolymer. The absorption maximum of the complex of PVAc-PVFA with iodine was observed to lie at 620 mμ for highly-acetalyzed polyvinyl alcohol and at 520 mμ for polyvinyl alcohol of a low degree of acetalyzation, while a new absorption maximum appeared in the range from 520 to 620 mμ in the intermediate case. The absorbances at the absorption maxima of the complexes of PVAc-PVFA with iodine were approximately the same as those of PVAc. The effect of an elevated temperature on the absorbance was smaller for PVAc-PVFA than for PVAc-PVPr. From these experiments, it became clear that the glass-transition temperature and the color intensity of the polymer-iodine complex have a simple relation.

• 公益社団法人 日本化学会の論文

著者

• Takayama Masanari

  Faculty of Fiber Science and Technology, Shinshu University

• Hayashi Sadao

  Faculty of Fiber Science and Technology, Shinshu University

• Kawamura Chozo

  Faculty of Fiber Science and Technology, Shinshu University

関連論文

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• Thermal Reactions of N-Phenylmaleimide and Mono- or Di-functional Allylphenols
• The Determination of the Iodine Affinity of Poly(vinyl acetate)
• Ground and excited states of hematoporphyrin and its derivatives.
• The Iodine Affinity of Polyvinyl Acetate and Its Derivatives
• Color Reactions of Poly vinyl Acetate and Its Derivatives with Iodine

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