The effect of solvent, graft density, and actuators-lubricants on the evaluation of friction and viscosity of slip additives

IF 3.8 4区工程技术 Q2 CHEMISTRY, APPLIED

Journal of Vinyl & Additive Technology Pub Date : 2024-12-27 DOI:10.1002/vnl.22189

Rafael Catarino-Centeno, Erwin García-Hernández

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引用次数: 0

Abstract

This work carried out a mesoscopic scale numerical modeling of a polymeric brush system constituted of a heterogeneous mixture of two slip additives erucamide (Eru) and stearyl erucamide (sEru). The polymeric brushes are grafted onto two parallel plates moving under a stationary laminar Couette-type flow in non-equilibrium conditions, to evaluate the coefficient of friction (Cof) and the viscosity system. The Cof and viscosity were obtained as a function of the graft concentration, solvent and brush composition, and the fixed number of Eru actuators-lubricants. It was found that the 2:1 ratio (Eru:sEru) seems to be the most effective in reducing the Cof in all cases, but specifically for the 80%-air/20%-humidity solvent composition, the Cof reaches a value of 0.33 keeping the number of Eru actuators-lubricants fixed at 400. Under the same conditions, viscosity reduction is favored at higher graft concentrations, reaching values of 0.8 and 0.7 respectively. The results indicate that by increasing the amount of Eru actuators-lubricants, the Cof decreases significantly with a higher concentration of grafts. This could be crucial to optimizing friction properties, impacting various applications such as the plastics and packaging industry, agricultural film production, lubricant, and textile coatings, where these slip additives are commonly used.

Highlights

Solvent composition influences the optimization of the Cof and viscosity.
Eru actuators-lubricants act as lubricating rollers in the solvent.
The mixture of the brushes reduces the Cof between the surfaces.
The molecular mechanism of slip additives is predicted at a mesoscopic scale.

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溶剂、接枝密度和致动器-润滑剂对滑动添加剂的摩擦和粘度评价的影响

本文采用介观尺度的数值模拟方法，研究了一种由两种滑脱添加剂鱼蜡酰胺（Eru）和硬脂酰鱼蜡酰胺（sEru）组成的非均质混合物聚合物电刷体系。在非平衡条件下，将聚合物刷接枝到两个平行板上，在静止层流库埃特型流动下运动，以评估摩擦系数（Cof）和粘度系统。Cof和粘度随接枝剂浓度、溶剂和电刷组成以及Eru致动器-润滑剂数量的变化而变化。研究发现，在所有情况下，2:1的比例（Eru:sEru）似乎是降低Cof最有效的，但特别是对于80%空气/20%湿度的溶剂组成，Cof达到0.33的值，保持Eru执行器-润滑剂的数量固定在400。在相同条件下，较高的接枝浓度有利于降低粘度，分别达到0.8和0.7。结果表明，随着Eru致动器润滑油用量的增加，Cof随接枝浓度的增加而显著降低。这对于优化摩擦性能至关重要，影响着塑料和包装工业、农膜生产、润滑剂和纺织涂料等各种应用，这些领域通常使用这些滑动添加剂。重点研究了溶剂组成对Cof和粘度的影响。制动器-润滑剂在溶剂中起润滑辊的作用。刷子的混合减少了表面之间的空隙。在介观尺度上对滑移添加剂的分子机理进行了预测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Vinyl & Additive Technology 工程技术-材料科学：纺织

CiteScore

5.40

自引率

14.80%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.