非离子Gemini表面活性剂的表／界面扩张性质

SURFACE/INTERFACE EXPANDING PROPERTIES OF NON-IONIC GEMINI SURFACTANT

为了解发生在非离子Gemini表面活性剂表／界面膜及附近的主要弛豫过程，加深对表／界面膜微观性质的认识，利用界面流变仪研究了非离子Gemini表面活性剂的表／界面扩张黏弹性，考察了聚合物和振荡频率对其表／界面扩张黏弹性的影响。实验结果表明：非离子Gemini表面活性剂的表面扩张黏弹性随表面活性剂质量分数增加出现极大值；表面扩张黏弹性随表面张力减小而降低；表／界面扩张弹性随振荡频率增加而增大，而表／界面扩张黏性随振荡频率增加出现极大值。非离子Gemini表面活性剂与聚合物二元体系的表面扩张黏弹性和相角均随着聚合物质量分数增加而增加；表面扩张黏弹性随着振荡频率降低而降低，而相角随着振荡频率降低而增加。

In order to know the main relaxation process happened on non-ionic Gemini surfactant surface/interra- cial film and nearby them, and moreover to further deepen the understandings of the microscopic properties of the surface/interfaeia] film, the surface expanding viscoelasticity of non-ionic Gemini surfactant surface/interface is studied by interracial rheometer, and furthermore the influences of the polymer and oscillatory frequencies on the viscoelasticity are researched. Tile results show that the surface expanding viscoelasticity of the surfactant appears the maximum value with the rise of the mass fractions; with reducing the surface tension, the surface dilational vis- coelasticity is decreased. The surface/interface expanding elasticity is increased with the frequency, but the sur- face/interface expanding viscosity occurs the peak value with the increase of the frequency. The surface expanding viscoelasticity and the phase angle of the binary system of the surfactant and polymer are enhanced with rise of the mass fractions of the polymer. The surface expanding viscoelasticity is decreased with the drop of the frequency, but the phase angles are just on the contrary.