二苯胺重氮盐与十二烷基硫酸钠在水溶液中的相互作用

报道了二苯胺-4-重氮盐(DDS)与十二烷基硫酸钠(SDS)在水溶液中的相互作用.实验结果表明,体系粘度随SDS/DDS物质的量比(ξ)的变化而急增急降.当ξ=0～0.9时,二者形成沉淀,体系的粘度基本不变;当ξ=1.9～2.3时,沉淀溶解并伴随着体系粘度急增,最高粘度达初始值的2520倍;之后,随ξ的增大,体系粘度迅速下降至初始值.对DDS-SDS聚集体的微观结构与体系粘度的关系进行了初步讨论.同时发现体系粘度是光敏性的,紫外光照可使其迅速下降.

Interaction of Diphenylamine-4-diazonium Salt and Sodium Dodecylsulfate in Aqueous Solution

The interaction of diphenylamine-4-diazonium salt(DDS) and sodium dodecylsu-fate(SDS) in aqueous solution was studied. The results show that, the relative viscosity(η_r) of solution(0=0.05 mol/L) changes with SDS/DDSmolar ratio ξ distinctly in three regions. In region Ⅰ(ξ=0～1.9), the DDSreacts with SDSto form precipitate and the η_ris low. In region Ⅱ( ξ =1.9～2.3), the precipitate dissolves and the η_rrises dramatically and reaches the maximum at ξ=2.3, which is 2520 times greater than that of original. In region Ⅲ( ξ >2.3). The relative viscosity of solution decreases rapidly with increasing ξ. The phenomenon has been interpreted as follows: the viscosity increasing of the solution is ascribed to the electrostatic attraction between the diazonium cation of DDSand the anion of SDS, further more the diphenylamine moiety of DDSembeds into the hydrophobic area of SDSrod micelles to form larger aggregates. As a result, the viscosity of the solution increases rapidly. It was confirmed that the viscosity change of the DDS/SDSsolution is sensitive towards light, i.e. the increased viscosity will decrease under irradiation of UVlight because the light decomposes the diazonium group. This behavior may be used to develop a light sensitive viscosity system.