支化结构对树枝状聚合物静态吸附特征的影响

采用浸泡法研究了不同支化程度的驱油用树枝状聚合物在石英砂上的静态吸附特征,并利用动静态激光光散射仪和环境扫描电子显微镜测定了聚合物溶液的分子尺寸和微观结构。结果表明,不同支化程度的树枝状聚合物溶液的等温吸附曲线均呈现三段式的吸附特点;在初始阶段,支化结构小的聚合物支链条数较少以及流体力学半径较小,其在固定表面积的石英砂上吸附位阻比支化结构大的聚合物小,导致吸附量较大;在吸附形式为多层吸附的Ⅱ、Ⅲ阶段,支化程度大的聚合物支化链间相互作用越强,易缠结形成网络结构,致使其在石英砂表面吸附层数多,吸附量比支化程度小的聚合物多。

Effect Research of Branched Structure to Static Adsorption Characteristics of Dendronized Polymers

Static adsorption characteristics of dendronized polymers for EOR at different branching degree on quartz sand were studied via soaking method, and the molecular size, microstructure of polymer solution were investigated though Dynamic and static laser light scattering instrument and Environmental Scanning Electron Microscope respectively. It was found that, all of isothermal adsorption curves of dendronized polymer solutions were presented to three stages; At initial stage, polymers owed small branching degree had smaller steric hindrance than polymers of large branching degree on quartz sand possessed constant surface area due to its fewer number of branched chains and smaller hydrodynamic radius, resulting that its adsorbing capacity greater. In the phase of multilayer adsorption, dendronized polymers had strong branching degree could easily wind and form a network structure because of the intense interaction of branched chain, leading that its adsorption layer and adsorption quantity on the quartz sand surface were more than polymers of weak branched degree.