双子阳离子表面活性剂与对羟基苯甲酸钠混合水溶液的流变行为

Rheological Behaviors of Mixed Gemini Cationic Surfactant and Sodium P-Hydroxybenzoate in Aqueous Solution

用流变学方法研究了N,N-二(十四烷基)-N,N,N,N-四甲基-2-羟丙二胺二氯化物(简写为G_(14)Cl_2)与对羟基苯甲酸钠(PHB)混合水溶液的流变性能.在添加盐存在下,所有的体系均出现剪切稀化现象;随着PHB浓度增加,一维胶束的增长发生,溶液的黏度增加.混合溶液的零剪切粘度与PHB浓度曲线上有最大值出现,之后粘度降低,最大值黏度的降低来自于胶束的枝化.动态流变测量显示粘弹性的体系符合Maxwell模型,具有单一结构松弛时间(τR).

Rheological behavior of N, N-ditetradecyl-N, N, N, N-methyl-2-hydroxypropyl diamine dichloride （referred to as G i 4C12） and sodium p-Hydroxybenzoate （PHB） mixed solut ion was studied in aqueous solution. In the presence of an organic salt, all systems exhibit a shear thinning phenomenon. With increasing PHB concentrations, one-dimensional micellar growth occurs and viscosity of solutions increases. A maximum viscosity appears in the curve of zero-shear viscosity ,η as a function of PHB con -centrations, then the viscosity decreased. Above the maximum the decrease in viscosity is ascribed to the branching of micelles in structure. Dynamic rheological measurements show that the viscoelastic solution follows the Maxwell model with a single relaxation time of structure （ tr）.