Visualization of Structural Deformation of Polymer Additives in Oil Under High Shear Flow

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-10-25 DOI:10.1007/s11249-024-01929-2

Tatsuya Kusumoto, Moritsugu Kasai, Mikihito Takenaka

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Abstract

Using a powerful synchrotron radiation X-ray source, we developed a cell that can perform Small Angle X-ray Scattering (SAXS) measurements under high shear (~ 10⁵ s⁻¹). We successfully and quantitatively visualized the deformation of polymer chains as polymer additives in oil under high shear. We found that poly(alkylmethacrylate) (PMA) with the lowest molecular weight was not deformed by the shear flow and did not show the shear thinning behavior. On the other hand, the other PMAs were deformed and exhibited shear-thinning behaviors. We compared the experimental results with the simulation by Ryder et al.( The Journal of Chemical Physics 45: 194906 (2006)) and found the shrink perpendicular to the flow direction in the experiment is stronger than that in the simulation, indicating that the rigidity of the polymer chains enhanced by long side groups induced the alignment of the chain along the flow direction. The decrease in viscosity was less than that estimated from the rate of deformation estimated by SAXS due to the effects of polydispersity of PMA polymers.

Graphical Abstract

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高剪切流动下油品中聚合物添加剂结构变形的可视化分析

利用强大的同步辐射 X 射线源，我们开发了一种可在高剪切力（约 105 s-1）条件下进行小角 X 射线散射 (SAXS) 测量的单元。我们成功地定量观测了油中聚合物添加剂聚合物链在高剪切下的变形。我们发现，分子量最小的聚烷基甲基丙烯酸酯（PMA）在剪切流动中没有变形，也没有出现剪切变稀行为。而其他 PMA 则发生了变形，并表现出剪切稀化行为。我们将实验结果与 Ryder 等人的模拟结果进行了比较（《化学物理杂志》45: 194906 (2006)），发现实验中垂直于流动方向的收缩比模拟中的收缩更强，这表明长侧基增强了聚合物链的刚性，促使链沿流动方向排列。由于 PMA 聚合物多分散性的影响，粘度的下降幅度小于 SAXS 估算的变形率。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.