摘要
经典染色理论认为,电解质主要通过增大离子强度,提高染料在染浴中的化学势起到促染作用;或者通过与离子型染料竞争染位,起到缓染作用。20世纪60年代,研究人员利用Donnan模型对离子型染料染离子型纤维进行深入研究,发现电解质还通过改变染浴体系的熵而影响染料-纤维间的疏水作用,在高电解质浓度条件下,电解质对疏水力的影响对上染率起到决定作用。校正后的Donnan模型能够很好地解释染色中加入电解质对上染率的影响。文中综述染色经典理论存在的问题,进而阐述了电解质对染料-纤维疏水力的贡献,及其对染色的影响,提出电解质在染色过程中通过同时改变体系焓变和熵变而影响染料上染。
It is believed that electrolytes have two dominant effects on dye adsorption. On one hand, addition of salts promotes the exhaustion of dyes by increasing the ionic strength so that the dye is held less tenaciously by water. On the other hand, the added salts may compete with the dye ions for available dye sites and function as retarding agents for ionic dyes. By apply- ing the Donnan model the researchers have conducted in-depth study of the ionic dyes sorption on ionic fibers in the 1960＇s. It is found that in addition to its contribution to enthalpy change of the system, added salts also cause the hydrophobic interaction between the dyes and the fiber to change, which intrinsically resulted from decreased order of water by the salts. By taking into account of the above mentioned effect, the experimental data can be fit well into a modified Donnan model, Therefore, added salts affect the dye adsorotion Process bv alterina the system＇s enthalpy and entropv at the same time.
出处
《印染》
北大核心
2013年第18期46-50,共5页
China Dyeing and Finishing
基金
东华大学中央高校基本科研业务费专项基金(12D10528)
