Shen Xiaoxing, Gao Pu, Jin Tingting, Ding Yi, Bao Chaoyan
College of Advanced Materials Engineering, Jiaxing Nanhu University, Jiaxing 314001, China.
Polymers (Basel). 2022 Jul 30;14(15):3108. doi: 10.3390/polym14153108.
In recent years, there has been significant interest in the study of spandex in high-elasticity sensors. As a new kind of special spandex, dyeable spandex shows strong adsorption capacity for anions. In this study, neutral red G was used as an anion adsorption simulator to study the adsorption mechanism of dyeable spandex on anionic materials. The structure of dyeable spandex was characterized by the modern instrumental analysis method, and the adsorption kinetics and thermodynamics of neutral red G on dyeable spandex were discussed. The results show that the use of mixed amines as chain extenders for dyeable spandex reduced the regularity of molecules and the crystallinity of spandex, which was beneficial to the diffusion adsorption of anions. On the other hand, the number of secondary amino groups increased, providing more adsorption sites under acidic conditions. The adsorption of neutral red G on dyeable spandex satisfied the quasi-second-order kinetics and the Langmuir adsorption model, indicating that dye adsorption on spandex was mainly electrostatic. The diffusion coefficient and equilibrium adsorption capacity of neutral red G on dyeable spandex increased significantly, whereas enthalpy and entropy decreased.
近年来，高弹性传感器中氨纶的研究备受关注。作为一种新型特种氨纶，可染氨纶对阴离子具有较强的吸附能力。本研究以中性红G作为阴离子吸附模拟物，研究可染氨纶对阴离子物质的吸附机理。采用现代仪器分析方法对可染氨纶的结构进行表征，并探讨了中性红G在可染氨纶上的吸附动力学和热力学。结果表明，采用混合胺作为可染氨纶的扩链剂，降低了分子规整性和氨纶结晶度，有利于阴离子的扩散吸附。另一方面，仲氨基数量增加，在酸性条件下提供了更多的吸附位点。中性红G在可染氨纶上的吸附符合准二级动力学和朗缪尔吸附模型，表明染料在氨纶上的吸附主要是静电吸附。中性红G在可染氨纶上的扩散系数和平衡吸附量显著增加，而焓和熵降低。
