Instituto Nacional de Investigaciones Nucleares, Carretera México Toluca s/n, La Marquesa Ocoyoacac 52750, Estado de México, Mexico.
Departamento de Ingeniería Química y Bioquímica, Tecnológico de Estudios Superiores de Ecatepec, Ecatepec de Morelos 55210, Estado de México, Mexico.
J Phys Chem B. 2021 Feb 18;125(6):1692-1704. doi: 10.1021/acs.jpcb.0c11087. Epub 2021 Feb 5.
The viscosity enhancement of a solvent produced by the addition of thickening branched polymers is predicted as a function of polymer concentration, branch length and persistence length, and strength of the covalent bonding interactions. Nonequilibrium, stationary-state Poiseuille numerical simulations are performed using the dissipative particle dynamics model to obtain the viscosity of the fluid. It is found that the clustering of the polymers into aggregates increases the viscosity and that it is more strongly affected by the strength of the bonding interactions. General scaling relationships are found for the viscosity as a function of the variables studied, which are expected to be useful for the design and synthesis of new viscosifying polymers. It is argued that our results can be applied to aqueous thickeners, of importance for colloidal fluids such as paints and coatings and also for nonpolar fluids such as supercritical CO, which is a promising nonhydraulic fracking fluid also useful in enhanced oil recovery.
增稠支化聚合物对溶剂黏度的增强作用可预测为聚合物浓度、支化长度和无规线团长度、共价键相互作用强度的函数。采用耗散粒子动力学模型进行非平衡稳态泊肃叶数值模拟，以获得流体的黏度。研究发现，聚合物聚集形成聚集体增加了黏度，并且其受键相互作用强度的影响更大。发现了黏度作为所研究变量的函数的一般标度关系，预计对新型增稠聚合物的设计和合成将有用。有人认为，我们的结果可应用于水基增稠剂，这对涂料和涂层等胶体流体以及超临界 CO 等非极性流体很重要，后者是一种有前途的非水力压裂液，也可用于提高石油采收率。
