疏水缔合水溶性聚丙烯酰胺的溶液结构的研究

STUDY ON CHARACTERIZATION OF MICROSTRUCTURE OF HYDROPHOBICALLY ASSOCIATING WATER-SOLUBLE POLYMER IN AQUEOUS MEDIA BY SCANNING ELECTRON MICROSCOPY AND ENVIRONMENTAL SCANNING ELECTRON MICROSCOPY

应用流变学方法及扫描电镜、环境扫描电镜手段对疏水缔合聚丙烯酰胺和传统的超高分子量部分的水解聚丙烯酰胺进行了对比研究。结果表明 ,在相同浓度的条件下 ,前者的增粘能力远大于后者。其原因在于前者通过疏水缔合作用在溶液中形成了三维网络状结构。在不同浓度和不同放大倍数的条件下观察到的溶液结构具有一定的自相似性 ,说明该疏水缔合水溶性聚合物的溶液结构具有一定的分形特性。

Hydrophobically associating water soluble polymers (HAWSPs) are novel promising hydrosoluble materials for petroleum recovery. They possess the characteristics of strong viscosification, insensitive mechanical degradation, heat resistance and salt tolerance. This research focused on the comparative charaterization of the structures in hydrophobically associating polyacrylamide (HAPAM) and ultrahigh molecular weight partially hydrolyzed polyacrylamide (HWHPAM) in aqueous solution by means of rheometry, scanning electronic microscopy (SEM) and environmental scanning electronic microscopy (ESEM). The results indicated that the viscosifying ability of HAPAM is much stronger than that of HWHPAM. Visual observations from SEM and ESEM confirmed the formation of three dimensional structures of HAPAM in aqueous solution, which resulted in a dramatic increase in polymer solution viscosity of HAPAM. Self similarity obtained from different polymer concentration via different amplifications of SEM and ESEM observations is an indication of fractal characteristics for the structure of hydrophobically associating water soluble polymers in aqueous media.theviscosifyingabilityofHAPAMis