Polymerization-Induced Self-Assembled Micelles in Oil as Lubricant Additives with Enhanced Tribological Properties

IF 4.4 2区化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Applied Polymer Materials Pub Date : 2024-04-11 DOI:10.1021/acsapm.4c00369

Hanfeng Liu, Junhui Gong, Pengrui Cao, Linjie Yang, Liming Tao, Xianqiang Pei, Tingmei Wang, Qihua Wang*, Jianqiang Zhang* and Yaoming Zhang*,

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Abstract

Lubricant additives (LAs) play a crucial role in enhancing the lubrication performance and durability of oils. However, inorganic nanoparticle (INP) LAs often encounter challenges related to poor dispersion stability. Here, polymer micelles were investigated as potential LAs to evaluate their effect on the lubricating properties of base oils and to explore their friction reduction mechanism. Through the polymerization-induced self-assembly (PISA) approach, spherical micelles of the block copolymer poly(lauryl methacrylate)–poly(benzyl methacrylate) (PLMA_x–PBzMA_y) were synthesized in oil. These micelles, prepared in situ, exhibited exceptional dispersion stability surpassing that of inorganic nanoparticles (SiO₂) for over 300 days. Tribological testing revealed that the self-assembled micelles could disentangle to form a robust layer of a polymeric tribofilm, effectively preventing wear on the contacting surfaces during friction. Consequently, the load-bearing capacity was significantly enhanced to 1000 N while maintaining a stable low coefficient of friction (COF) and low wear rate. This work presents a design protocol for LAs distinguished by their superb dispersion stability, antifriction, and antiwear characteristics.

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聚合诱导的油中自组装胶束作为润滑油添加剂可增强摩擦学性能

润滑油添加剂（LA）在提高润滑油的润滑性能和耐用性方面发挥着至关重要的作用。然而，无机纳米粒子（INP）LA 通常会遇到分散稳定性差的难题。在此，研究人员将聚合物胶束作为潜在的 LAs 进行了研究，以评估它们对基础油润滑性能的影响，并探索它们的减摩机理。通过聚合诱导自组装（PISA）方法，在油中合成了嵌段共聚物聚（甲基丙烯酸十二烷基酯）-聚（甲基丙烯酸苄基酯）（PLMAx-PBzMAy）的球形胶束。这些在原位制备的胶束在超过 300 天的时间内表现出超越无机纳米粒子（SiO2）的优异分散稳定性。摩擦学测试表明，自组装胶束可分离形成一层坚固的聚合物三膜，有效防止摩擦过程中接触表面的磨损。因此，在保持稳定的低摩擦系数（COF）和低磨损率的同时，承载能力显著提高到 1000 N。这项研究提出了一种 LA 的设计方案，这种 LA 具有出色的分散稳定性、抗摩擦性和抗磨损性。

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来源期刊

ACS Applied Polymer Materials Multiple-

CiteScore

7.20

自引率

6.00%

发文量

810

期刊介绍： ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.