基于自组织的两亲聚合物驱油剂粘弹性的影响机理

通过测定疏水缔合两亲聚合物(HAP)黏浓关系曲线,确定其临界缔合浓度(CAC)为800mg/L。应用原子力显微镜(AFM)研究CAC前后溶液的微观结构形貌,证实溶液中存在超分子自组织网络结构。利用MCR301流变仪,探讨了Na+、K+、Ca2+、Mg2+、S2-对动态粘弹性和稳态剪切流变的影响,结果表明,5种离子均使HAP体系的弹性模量G′降低,其降低幅度符合指数递减规律,且二价金属阳离子的影响大于一价金属阳离子。从自组织微观结构角度深入探讨了聚集体缔合结构变化对聚合物粘弹性的影响机理。

Viscoelastic Effect Mechanism of Amphiphilic Polymer Oil Displacement Agent with Self-Organization Behavior

The viscosity-concentration relationship curve was measured and 800 mg/L of the critical aggregation concentration (CAC) was determined.The microstructure morphology was studied by atomic force microscopy (AFM) with dilute solution under the CAC and concentrated solution above it and the existence of solution supramolecular self-organizing network structure was confirmed.Effect of Na+、K+、Ca2+、Mg2+、S2-on dynamic viscoelasticity and steady-state shear rheology was discussed according to the results of MCR301 rheometer.Five kinds of ions decrease elastic modulus G′ of HAP,it meets index decreasing law.The impact of divalent metal cations is greater than that of a valent metal cation.The variation trend is different from dynamic G′.Microstructure of self-organization from the molecular chain and aggregates associative structure change was deeply explored on the impact of the mechanism of viscoelastic polymers.