133.ポリビニルクラウンエーテルの溶液物性 : I.ポリビニルベンゾ-15-クラウン-5の合成と双極子モーメント

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We have synthesized 4'-vinylbenzo-15-crown-5, one of the monomeric macrocyclic polyethers or crown ethers, using catechol and tetraethylene glycol as starting materials by a general synthetic route and then prepared poly (vinylbenzo-15-crown-5), PB15C5, by radical polymerization. The dipole moments of PB15C5 were deteremined from dielectric constant and density measurements performed on dilute benzene (Bz) and toluene (Tol) solutions over the temperature range of 25 to 55℃. The average dipole moments per constitutional repeating unit, <μ^2>^<1/2>, obtained at 25℃ are 2.773D (Bz) and 2.769D (Tol). The dipole moment ratio, <μ^2>/μ^2_0, was found to be 1.057_3 in toluene at 25℃ for which the observed value of μ_0=2.693 for benzo-15-crown-5 in toluene was used. The variation of the dipole moment ratio with temperature was vanishingly small.
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