表面活性剂在微胶囊表面吸附的动力学模拟

采用耗散粒子动力学(Dissipative Particle Dynamics,DPD)方法,模拟了表面活性剂在接枝型两亲性共聚物形成的微胶囊表面的吸附情况。对亲水性聚合物的接枝密度和长度对表面活性剂吸附的影响进行了研究。结果表明,接枝亲水性聚合物能有效的阻止表面活性剂在微胶囊表面的吸附,当接枝长度不变时,接枝密度在2~5根枝时既能有效的阻止表面活性剂的吸附,又能保持微胶囊的形状,此时,亲水部分与憎水部分的体积比在0.1667~0.4167之间;当接枝密度固定时,接枝长度大于4个珠子时就能有效的阻止表面活性剂的吸附。

Dissipative Particle Dynamics of Surfactant Adsorption on the Surface of Polymeric Micelles in Aqueous Solution

Dissipative particle dynamics simulation is performed to study surfactant adsorption on the surface of polymeric micelles in aqueous solution.In this paper,the length and density of the hydrophilic polymer graft chain have great effect on the surfactants adsorption on the amphiphilic micelles.The results indicate that the graft hydrophilic polymer could effectively prevent surfactant from adsorbing on the surface of micelles.If the length of the graft chain is unchanged and the number of the graft chain is between 2 and 5,0.166 7~0.416 7 volume fraction of hydrophilic polymer,polymeric micelles can effectively prevent surfactant from adsorbing on their surface.It is effective for polymeric micelles to prevent surfactant from adsorbing on their surface when the length of the graft chain is longer than 4 beads.