The Transport of Direct Dyes into Celluloses Membranes in the Presence of Polyelectrolytes

聚电解质存在下直接染料向纤维素膜的传输

• 批准号: 60580057
• 负责人: MASAKO Maekawa
• 金额: $ 1.28万
• 依托单位: Nara Women's university
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60580057/
• 关键词: Polyelectrolyte; Direct dye; Cellulose membrane; Transport

The effect of polyelectrolytes on the transport of various sulfonated direct dyes, C.I.Direct Yellow 12, C.I.Direct Red 2 and C.I.Direct Blue 15 from aqueous solution into a cellulose membrane has been studied at 25゜C and 55゜C. The diffusion of the dye into the cellulose membrane was analysed on the basis of parallel transport mechanism of surface and pore diffusion as developed in our previous paper, J. Appl. Polym. Sci.,32,4185 (1986). The relation between the fractional attainment of equilibrium and the time, and concentration profiles of the dye in the membranes, revealed that the diffusion of the dyes in this system is controlled by surface diffusion rather than pore diffusion. The nature and concentration of the polyelectrolyte influenced the adsorption equilibrium and also the rate of diffusion of the dye into the cellulose membrane but had no effect on the diffusion coefficient of the dye. The diffusion coefficients of dye obtained in the presence of the polyelectrolyte agree well with those obtained in the presence of small inorganic electrolytes. The osmotic pressure due to the addition of the polyelectrolyte does not affect the diffusivity of the dye into the cellulose membrane.

在25゜C和55゜C下，研究了聚电解质对磺化直接染料C.I.直接黄12、C.I.直接红2和C.I.直接蓝15从水溶液向纤维素膜的迁移的影响。根据我们以前的论文J.Appl发展的表面和孔扩散的平行迁移机理，分析了染料向纤维素膜的扩散。波兰姆。《科学》，32,4185(1986)。平衡分数与时间的关系以及染料在膜中的浓度分布表明，染料在该体系中的扩散是由表面扩散控制的，而不是孔扩散控制的。聚电解质的性质和浓度影响染料在纤维素膜中的吸附平衡和扩散速率，但不影响染料的扩散系数。在聚电解质存在下测得的染料扩散系数与在小的无机电解质存在下测得的扩散系数符合得很好。由于添加聚电解质而产生的渗透压不会影响染料向纤维素膜的扩散。