161. 高分子化合物とその構造単位に相当するモデル化合物の分子形態 : ポリエチレンオキシドのモデル化合物1,2-ジメトキシエタンのコンホメーション

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Dipole moments (μ) of 1,2-dimethoxyehtane (DME), a monomeric model compound of poly (ethylene oxide) (PEO) were determined from the measurements of dielectric constant and density on toluene and dioxane solutions over the temperature range from 25 to 55℃. The dipole moments obtained for DME are 1.693 D in toluene and 1.804 D in dioxane at 30℃. Theμvalues in both solvents increase slightly with temperature, the temperature coefficients dln <μ^2>/dT were found to be 0.82×10^<-3> K^<-1> in toluene (25〜55℃) and 0.80×10^<-3> K^<-1> in dioxane (25〜35℃). The dipole moment ratios <μ^2>/nm^2 calculated for DME with the bond dipole moment of m =1.18 D are 0.51 in toluene and 0.58 in dioxane, which are larger than the value of 0.39 for PEO in benzene. Theμvalues computed by the molecular mechanics calculation for the DME were compatible with the experimental results.
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