Abstract The interactions of cationic surfactant cetyltrimethyl ammonium chloride (CTAC) and polyacrylamide (PAM) in drag reduction solutions are studied by experiments and simulations. Cryogenic Transmission Electron Microscopy shows that CTAC and PAM form aggregates with interconnected network structures, and the bridge effect from polymers can improve the network structures’ density. The associated potential of mean force (PMF) value indicates that surfactant/polymer attractions contribute to the formation of aggregates. Meanwhile, the mechanism of the enhanced drag reduction performance of surfactant/polymer solution is discussed by the extension energy of the aggregate structures. It is found that the interactions of surfactants and polymers help to improve the anti-shear performance of the surfactant micelles. Furthermore, polymers can balance micelles energy distribution, postpone the appearance of energy extreme point, and delay the rupture of micelles. This work fundamentally demonstrates that interactions and strengthened structures of micelle aggregates can intensify drag reduction in surfactant/polymer solutions.

中文翻译：

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通过表面活性剂和聚合物的相互作用增强减阻性能

摘要 通过实验和模拟研究了阳离子表面活性剂十六烷基三甲基氯化铵（CTAC）和聚丙烯酰胺（PAM）在减阻溶液中的相互作用。低温透射电子显微镜显示 CTAC 和 PAM 形成具有互连网络结构的聚集体，聚合物的桥接效应可以提高网络结构的密度。平均力 (PMF) 值的相关电位表明表面活性剂/聚合物吸引力有助于聚集体的形成。同时，通过聚集体结构的延伸能讨论了表面活性剂/聚合物溶液增强减阻性能的机制。发现表面活性剂与聚合物的相互作用有助于提高表面活性剂胶束的抗剪切性能。此外，聚合物可以平衡胶束能量分布，延缓能量极值点的出现，延缓胶束的破裂。这项工作从根本上证明了胶束聚集体的相互作用和增强的结构可以加强表面活性剂/聚合物溶液的减阻。