Preparation of polyacrylamide microspheres with core-shell structure via surface-initiated atom transfer radical polymerization
Preparation of polyacrylamide microspheres with core-shell structure via surface-initiated atom transfer radical polymerization
复制标题
表面引发原子转移自由基聚合制备核壳结构聚丙烯酰胺微球
作者：
Zhang Peng;Bai Shixun;Chen Shilan;Li D;an;Jia Zhenfu;Zhou Chengyu;Feng Jian;Yu Li
以预交联聚丙烯酰胺为核、非交联聚丙烯酰胺为壳，通过表面引发原子转移自由基聚合制备了结构明确的核壳微球。所得微球的直径小于1μm，壳厚度为数十纳米。研究了聚合动力学、数均分子量和分散性。通过红外光谱（IR）、核磁共振（1H-NMR）光谱、热重分析（TGA）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对材料进行了表征。还研究了材料的粘度和溶胀性能。在相同条件下，使用这些微球获得的增量采油率高于聚丙烯酰胺。
Well defined core–shell microspheres were prepared by surface-initiated atom transfer radical polymerization with pre-crosslinked polyacrylamide as the core and non-crosslinked polyacrylamide as the shell. The obtained microspheres have diameters less than 1 μm with a few tens of nanometers shell thickness. The polymerization kinetics, number-average molecular weight and dispersity were investigated. The materials were characterized with infrared spectroscopy (IR), nuclear magnetic resonance (1H-NMR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The viscosity and swelling property of materials were also investigated. The incremental oil recovery obtained with these microspheres is higher than that with polyacrylamide under the same conditions.