70.高分子化合物の双極子モーメントに関する研究 : III.p-メトキシトルエン,p-ブロモエチルベンゼンおよびp-ブロモトルエンの双極子モーメント

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Dipole moments of p-methoxytoluene (p-MeOTol), p-bromoethylbenzene (p-BrEtBz) and p-bromotoluene (p-BrTol) were determined from dielectric constant and density measurements on their dilute benzene and dioxane solutions over the temperature range of 25〜55℃. The dipole moments, μ_0, measured in benzene at 25℃ were 1.257 D for p-MeOTol and 2.007 D for p-BrEtBz. Ca. 2% increase in μ_0 was observed for p-MeOTol and p-BrEtEz in dioxane where 1.285 D and 2.047 D were obtained respectively. It was found that μ_0 is dependent on temperature; the values of μ_0 for p-MeOTol, p-BrEtBz and p-BrTol in benzene slightly increased as the temperature was raised. Solvent and temperature dependences of μ_0 were interpreted on the basis of the Higashi's theory. The dipole moment ratio, <μ^2>/μ_0^2, of poly(p-methoxystyrene)(PMeOSt) and poly (p-bromostyrene)(PBrSt) in dioxane at 25℃ was evaluated using μ_0 values obtained for p-MeOTol and p-BrEtBz in dioxane, as 0.924 for PMeOSt and 0.461 for PBrSt.
東京女子大学の論文
1986-03-15