College of Textiles & Clothing, State Key Laboratory for Biofibers and Eco-textiles, Collaborative Innovation Center for Eco-textiles of Shandong Province, Qingdao University, Qingdao 266071, China.
Molecules. 2020 Mar 30;25(7):1588. doi: 10.3390/molecules25071588.
The aggregation structure of dye molecules has a great influence on the properties of dye solutions, especially in high concentration. Here, the dye molecular aggregation structures were investigated systemically in aqueous solutions with high concentration using three reactive dyes (O-13, R-24:1 and R-218). O-13 showed stronger aggregation than R-24:1 and R-218. This is because of the small non-conjugate side chain and its β-linked position on the naphthalene of O-13. Compared with R-218, R-24:1 showed relatively weaker aggregation due to the good solution of R-24:1. The change of different aggregate distributions in the solutions were also investigated by splitting the absorption curves. Moreover, it is found that the surface tension of solutions can be modified by the combined effect of both aggregation and the position of the hydrophilic group, which, however, also have an effect on viscosity. This exploration will provide guidance for the study of high concentration solutions.
染料分子的聚集结构对染料溶液的性质有很大的影响，尤其是在高浓度下。在这里，使用三种反应性染料（O-13、R-24:1 和 R-218）系统地研究了高浓度水溶液中的染料分子聚集结构。O-13 的聚集性强于 R-24:1 和 R-218。这是因为 O-13 萘上的小非共轭侧链及其β连接位置。与 R-218 相比，R-24:1 的聚集性相对较弱，这是因为 R-24:1 的溶解性好。通过拆分吸收曲线还研究了溶液中不同聚集物分布的变化。此外，还发现溶液的表面张力可以通过聚集和亲水基团位置的共同作用来调节，然而，这也会对粘度产生影响。这项探索将为高浓度溶液的研究提供指导。
