69.高分子化合物の双極子モーメントに関する研究 : II.ポリ-p-メトキシスチレン,ポリ-p-ブロモスチレン,ポリ-2-ビニルピリジンの双極子モーメント

概要

論文の詳細を見る
Samples of poly(p-methoxystyrene)(PMeOSt) with M_n=4.1×10^4, poly(p-bromostyrene)(PBrSt) with M_n=10.0×10^4, and poly (2-vinylpyridine)(P2VP) with M_n=3.9×10^4 were prepared by radical polymerization (M_n; number-average molecular whight). The mean square dipole moments of the three polymers were determined from dielectric constant measurements on dilute solutions of the polymers in benzene and dioxane. The average dipole moments per repeat unit, μ, obtained in benzene (Bz) and dioxane (D) at 25℃ were as follows; 1.219 (Bz) and 1.234 (D) for PMeOSt, 1.371 (Bz) and 1.381 (D) for PBrSt, and 1.813 (Bz, D) for P2VD (in debye unit). The dipole moment ratio, D_r=<μ^2>/m^2 in benzene at 25℃ were determined as 0.942 for PMeOSt, 0.467 for PBrSt and 0.679 for P2VP, in which m is the dipole moment of a structural unit, and the observed values of p-methoxytoluene (1.257), p-bromoethylbenzene (2.007), and pyridine (2.20) were used as m for the respective polymers. Temperature dependence of the dipole moments was investigated for PMeOSt and PBrSt in benzene over the temperature range of 25〜55℃; the dipole moments slightly increased as the temperature was raised, leading to d ln<μ^2>/dT=8.97×10^<-4>K^<-1> (25〜35℃) and 2.80×10^<-4>K^<-1> (45〜55℃) for PMeOSt, and 1.49×10^<-3>K^<-1> (25〜35℃) and 8.95×10^<-4>K^<-1> (45〜55℃) for PBrSt. In addition, the values of D_r=<μ^2>/m^2 and d ln<μ^2>/dT were calculated using the "rotational isomeric state" theory, and the results were compared with the experimental values.
東京女子大学の論文
1986-03-15

69.高分子化合物の双極子モーメントに関する研究 : II.ポリ-p-メトキシスチレン,ポリ-p-ブロモスチレン,ポリ-2-ビニルピリジンの双極子モーメント

スポンサーリンク

概要

著者

関連論文

スポンサーリンク