明胶层中的扩散和反应的动力学研究——(Ⅴ)油溶性成色剂的偶合反应的动力学

KINETICS OF DIFFUSION WITH CHEMICAL REACTION IN A GELATIN LAYER (Ⅴ) THE COUPLING REACTION OF A SOLVENT DISPERSION COUPLER WITH QDI

研究了明胶层中油溶性成色剂油珠的偶合反应动力学。通过实验和数值模拟的比较证明:在明胶层中油溶性成色剂(C-1)油珠与彩色显影剂CD-4的氧化产物的偶合反应主要是发生在油珠-明胶水溶液的界面上。偶合反应速度与油珠大小、比速率常数、成色剂在油相中的浓度以及QDI的扩散系数有关。并且得到C-1成色剂油珠的比速率常数、CD-4氧化产物的扩散系数以及QDI和生成的染料在明胶层中的时空分布。同时观察到温度对偶合反应动力学的影响。

A flow-apparatus and a numerical model for simulating diffusion with a reaction on surface of droplets which were dispersed in a gelatin layer were employed for investigating the kinetic process of the coupling reaction of QDI with dispersion coupler in the gelatin layer. The results showed that the kinetic curves obtained from both the experiments and the numerical model were in quite good agreement. This suggested that the coupling reaction took place do-minantly at the interface between droplets and gelatin-aqueous solution and that the reaction was dependant on the size of droplets, specific rate constant, concentrations of coupler in the organic medium and of QDI on the surface of droplets, which was closely related to the diffusion coefficient of QDI in the gelatin layer. Some valuable parameters and influences of temperature on kinetics of the coupling reation were observed.