Dynamic Covalent Polymer–Nanoparticle Networks as High-Performance Green Lubricants: Synergetic Effect in Load-Bearing Capacity,Macromolecules

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Dynamic Covalent Polymer–Nanoparticle Networks as High-Performance Green Lubricants: Synergetic Effect in Load-Bearing Capacity
Macromolecules ( IF 5.1 ) Pub Date : 2024-08-21 , DOI: 10.1021/acs.macromol.4c01397
Hua Xue ₁ , Changhao Wang ₁ , Fengchun Liang ₁ , Jiapeng He ₁ , Qun He ₁ , Meirong Cai ₂ , Qiang Tian ₃ , Guanjun Chang ₃ , Qing Huang ₄ , Muhammad Siddiq ₅ , Feng Zhou ₂ , Weifeng Bu _{1,

2}

Affiliation

Although conventional lubricant additives containing sulfur and phosphorus elements have been widely utilized to lower friction and wear, harmful emissions caused by the lubrication processes have resulted in serious environmental concerns. In this work, a series of polymer–nanoparticle networks have been in situ constructed in base oil by coupling phenylboronic ester-containing telechelic polymers and silica or titania nanoparticles via dynamic B–O covalent bonds. These sulfur- and phosphorus-free composites appear as the form of oleogels, wherein the nanoparticles show long-time dispersible stability. Ball-on-disc reciprocating sliding tribological tests display that the dynamic covalent networks give rise to remarkable reductions of the base oil in coefficient of friction (up to 52%) and wear volume (up to 93%). Moreover, high bearing loads of the polymer–nanoparticle composites are readily realized at 1100 N, which is higher than those of the telechelic polymers (900 N) or nanoparticles (600 N) alone. Such positive cooperativity in load-bearing capacity originates from nanometric thick tribofilms containing both B₂O₃ and β-SiC or TiC formed at the rubbing interfaces. The present concept of combining nanoparticles with dynamic covalent chemistry provides a promising approach to create high-performance green lubricants.

中文翻译：

动态共价聚合物-纳米粒子网络作为高性能绿色润滑剂：承载能力的协同效应

尽管含有硫和磷元素的传统润滑油添加剂已被广泛用于降低摩擦和磨损，但润滑过程引起的有害排放已导致严重的环境问题。在这项工作中，通过动态 B-O 共价键偶联含苯基硼酸酯的遥爪聚合物和二氧化硅或二氧化钛纳米颗粒，在基础油中原位构建了一系列聚合物-纳米颗粒网络。这些不含硫和磷的复合材料以油凝胶的形式出现，其中纳米颗粒表现出长期的分散稳定性。球盘往复滑动摩擦学测试表明，动态共价网络使基础油的摩擦系数（高达 52%）和磨损体积（高达 93%）显着降低。此外，聚合物-纳米颗粒复合材料在1100 N下很容易实现高承载载荷，这高于单独的遥爪聚合物（900 N）或纳米颗粒（600 N）的承载载荷。这种承载能力的正协同性源于摩擦界面处形成的同时含有B ₂ O ₃和β-SiC或TiC的纳米厚摩擦膜。目前将纳米粒子与动态共价化学相结合的概念为制造高性能绿色润滑剂提供了一种有前途的方法。

更新日期：2024-08-21

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