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用毛细管振荡剪切流动法研究了联接基团为聚亚甲基链的阳离子 Gemini表面活性剂的流变性质。实验结果表明 ,无论是普通单链单头基或 Gemini表面活性剂 ,其流变性质主要由胶团的大小和形状所决定 ;随着联接基团长度的增加 ,胶团的轴比率变小 ,导致流动阻力减小 ,粘度降低。此外对于球形和棒状胶团溶液 ,其流变性质主要以粘性为主 ,弹性可忽略不计。在低剪切速率下 ,溶液属于牛顿型流体 ;而在高剪切速率下 ,则表现出准塑性流体性质。
The rheological properties of the cationic Gemini surfactant with polymethylene linkages were investigated by capillary oscillatory shear flow. The experimental results show that the rheological properties of both single-chain monolayers or Gemini surfactants are mainly determined by the size and shape of micelles. With the increase of linker length, the axial ratio of micelles decreases, Resulting in reduced flow resistance and lower viscosity. In addition, spherical and rod micelles solution, the rheological properties of the main viscous, elastic negligible. At low shear rates, the solution belongs to the Newtonian fluid, whereas at high shear rates it exhibits the property of quasi-plastic fluid.