不同浓度交联聚合物微球溶液的微观形态和流变特性

Microspheres microstructure and rheological behavior of crosslinked polymer microspheres solution of different concentration

为了研究交联聚合物微球水溶液的流变性能与微球微观形态之间的关系,测定了不同浓度交联聚合物微球溶液的流变性能,利用环境扫描电镜观察了不同浓度交联聚合物水溶液中微球的微观结构形态,系统研究了微球溶液的流变性与聚合物微球浓度的关系,并分析了微球溶液流变性随浓度和剪切速率变化的原因。结果表明:随着聚合物微球浓度的增加,溶液的胀流性逐渐减弱,假塑性逐渐增强,时间效应也相应地增强;随着剪切速率的增加,低浓度的微球溶液与高浓度的微球溶液呈现出不同的流变特征,利用环境扫描电镜观察得到的水中微球的微观结构形态很好地解释了这一现象,为进一步研究深部液流改向和调剖机理提供理论支持。

In order to reveal the relationship between the rheological properties of crosslinked polymer microspheres solution and the microcosmic morphology of microspheres,the rheological properties of the crosslinked polymer microspheres solution of different concentration are measured,and the microcosmic morphologies of the microspheres in those solution are observed through environmental scanning electron microscope. The relationship between the rheological property of the crosslinked polymer microspheres solution and the concentration of the microspheres is systematically studied and the causes why the rheological property of the crosslinked polymer microspheres solution varies with the concentration of the microspheres and shearing rate are analyzed. The results show that: with the increase of the concentration of polymer microspheres,the dilatant property of the solution gradually reduces,the pseudoplastic property and the time effect of the solution gradually increase; with the increase of shearing rate,the rheological characteristics of the microspheres solution of low concentration are different from those of the microspheres solution of high concentration,which is well explained by the microstructure morphology of the microspheres in the aqueous solution obtained from environmental scanning electron microscope,and provides the theoretical support for further studying the flow redirection and the mechanism of deep profile control.