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利用表面波技术测定起泡剂C12E8的表面流变学性质以及通过对三种吸附模型(扩散是速率控制步骤,吸附-脱附是控制步骤和混合模型)的研究,揭示了C12E8溶液表面的吸附机理.认为在浓度小于cmc的范围内,C12E8分子的吸附和脱附是一个迅速的过程,而表面吸附速率是由分子从本体溶液到次表面层的迁移所控制.利用扩散是吸附速率控制步骤模型和Frulnkin状态方程研究了扩散系数、松弛特征频率、极限膨胀模量随C12E8浓度变化的规律,以及它们与表面张力梯度修复机理的关系.
The surface rheological properties of the foaming agent C12E8 were determined by using the surface wave technique and the adsorption on the surface of the C12E8 solution was revealed by studying the three adsorption models (diffusion rate control step, adsorption step-by-step control step and mixed model) mechanism. It is considered that the adsorption and desorption of C12E8 molecules are a rapid process in the concentration range of less than cmc, and the surface adsorption rate is controlled by the migration of molecules from the bulk solution to the subsurface layer. The diffusion coefficient, relaxation characteristic frequency and ultimate expansion modulus with the concentration of C12E8 were studied by using the diffusion rate control step model and the Frulnkin equation of state, and their relationship with the surface tension gradient repair mechanism.