Solution properties of low molecular weight fractions of poly(2-vinylpyridine).
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概要
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The relationships between the weight-average molecular weight <I>M</I><SUB>w</SUB> and the intrinsic viscosity [η] of poly(2-vinylpyridine) [P2VP] in benzene and methyl alcohol at 25 °C, were investigated by the use of fractions with molecular weights ranging from 2.1×10<SUP>3</SUP> to 2.3×10<SUP>4</SUP>. The exponent ν in the Mark-Houwink-Sakurada equation, [η]=<I>K</I><SUB>0</SUB><I>M</I><SUB>w</SUB><SUP>ν</SUP>, was 0.5 in both solvents when <I>M</I><SUB>w</SUB> was lower than about 10<SUP>4</SUP>. A constant <I>K</I><SUB>0</SUB> was approximately in accord with Flory's <I>K</I><SUB>θ</SUB> value for ordinary high-molecular-weight P2VP, obtained earlier in respective solvents. By measuring [η] for these low-molecular-weight fractions in several solvents at different temperatures, the temperature coefficients of an unperturbed dimension, <I>d</I>ln\bar<I>r</I><SUP>2</SUP><SUB>0</SUB>⁄<I>dT</I>, of this polymer were estimated and averaged to be −2.3×10<SUP>−3</SUP> K<SUP>−1</SUP>. These are quite different from the positive values calculated from the <I>K</I><SUB>θ</SUB>'s by Dondos <I>et al.</I> which were estimated using the extrapolation method for non-θ-solvents. Our results were further corroborated after adding a <I>K</I><SUB>θ</SUB> value which was directly determined at another θ-state; <I>i.e.</I> in toluene at 63.7 °C, to that in benzene at 16.2 °C published earlier, which was found from phase-separation experiments in this work.
- 公益社団法人 日本化学会の論文
著者
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Yamaguchi Shinsuke
Department Of Chemical Engineering Faculty Of Engineering Kyushu University
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Yoshida Masafumi
Department Of Chemistry Faculty Of General Education Kumamoto University
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Sakamoto Noriyuki
Department of Chemistry, Faculty of General Education, Kumamoto University
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Arichi Shizuo
Department of Chemistry, Faculty of General Education, Kumamoto University
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