ペンダントイミダゾール基をもつ重合体の触媒作用 : 動力学定数と速度定数

概要

論文の詳細を見る
Two different kinetic figures were obtained between neutral substrates and poly [3, 3'-substituted biphenyls-co-vinylimidazole(VIm)] by the influence of 3,3'-substituents. For both neutral substrates of ester and azolide (heterocyclic amide), the second-order rate constants calculated from kinetic figures (k_1/K_L) and the secOnd-order catalytic rate constants (k_) were largely enhanced by the reduction of ethanol concentration lesser than 30 vol% in contrast to the rapid decrease in viscosities of catalyst solutions. Both second-order rate constants of rigid copolymers were considerably smaller than those for poly[4-(5)-VIm](PVIm)-catalysis owing to the decrease in hydrophobic interaction between neutral substrates and rigid copolymer chain. From the saturated figures between cationic substrates and poly[VIm-c0-acrylic acid], maximum k_1/K_L, was calculated at about 50 mol% VIm content. This profile Is similar to a curve pictured by calculating the sequence distribution for the (VIm-COOH) linkage unit in the copolymer chain but disagreed with that for the (VIm-VIm) linkage unit. The phenomenon is perhaps caused by the attraction of cationic substrates toward the COO- group in the Im-containing copolymer catalyst.
山形大学の論文
1980-01-21