原子力显微镜在聚合物溶液结构研究中的应用

The atomic force microscopy study on the microstructure of the polymer solution

驱油用水溶性聚合物溶液的应用性能由其聚合物溶液的微观结构所决定,因此在驱油用聚合物合成及配方研究中迫切需要研究其溶液的微观结构。本文使用原子力显微镜(AFM)、环境扫描电镜(ESEM)和透射电镜(TEM)观察了水溶液中聚合物(HAWSP,AP-P4)的微观结构。研究发现常温常压下原子力显微镜观察到的聚合物网络结构图案清晰,边界分辨率高。透射电镜观察到的聚合物网络结构较模糊且网络结构有断裂现象。环境扫描电镜观测到的网络结构尺寸大小是AFM观测到的几倍甚至是十几倍。动态光散射(dynamic light scattering,DLS)结果证明AFM和TEM所观测到的聚合物结构最接近于真实结构。结果表明使用原子力显微镜在观察水溶性聚合物类样品时,能够较真实反映其微观结构。

The application properties of polymers for flooding are determined by their microstructures.So it is important to study on the microstructures of synthesization and direction of polymer.AFM、ESEM and TEM are used to observe the microstructures of the polymers.The AFM graphs show that the pattern of the network structure is clearer than the other two microscopies.The ESEM graphs show that the size dimension of the network structure is several times of the other two methods.The TEM graphs show that the pattern of the network structure is indistinct.Combining the data of DLS,the AFM and TEM can give the actual microstructure of the polymers.The data indicates that AFM is more suitable to observe the water-soluble polymers because of the simple sampling preparation,normal temperature and pressure.