The Specific Refractive Index Increment and the Partial Specific Volume of Atactic Poly (2-vinylpyridine)

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概要

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• The specific refractive index increment, <I>dn</I>⁄<I>dc</I>, of atactic poly(2-vinylpyridine) was measured in 18 solvents with 436 nm light at 25 °C. Using these data, the partial specific volume, \barν<SUB>2</SUB>, of the polymer in these solvents was then evaluated by means of the method proposed by Heller. A sufficient agreement was found between the values of \barν<SUB>2</SUB> thus obtained optically and those determined directly by the density measurement of solutions in several solvents. It was found that \barν<SUB>2</SUB> varies considerably with the kind of solvent and that, in some solvents, such as methanol and ethanol, it takes an extremely lower value than that of bulk crystalline isotactic poly(2-vinylpyridine). The results were discussed in terms of thermodynamic interactions between the polymer and the solvent, the molar volume, and the compressibility of the solvent molecule. The relationship between <I>dn</I>⁄<I>dc</I> and the refractive index of a solvent, <I>n</I><SUB>1</SUB> for 436 nm light is expressed by <I>dn</I>⁄<I>dc</I>=0.900× (1.628–<I>n</I><SUB>1</SUB>).

• 公益社団法人 日本化学会の論文

著者

• Arichi Shizuo

  Chemical Laboratory, Department of General Education, Kumamoto University

• Ogawa Yoshihiro

  Chemical Laboratory, Department of General Education, Kumamoto University

• Yoshida Masafumi

  Chemical Laboratory, Department of General Education, Kumamoto University

関連論文

• Anomalous Light Scattering by Poly(2-vinylpyridine) in Methanol
• The Specific Refractive Index Increment and the Partial Specific Volume of Atactic Poly (2-vinylpyridine)

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