Molecular Mechanisms of Polyoxymethylene Wear

IF 0.5 4区 工程技术 Q4 ENGINEERING, MECHANICAL Journal of Friction and Wear Pub Date : 2024-07-03 DOI:10.3103/S1068366624700041
A. O. Pozdnyakov, Li Syanshun, E. B. Sedakova
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Abstract

Friction and wear of polyoxymethylene upon friction against polyoxymethylene and polyetheretherketone have been analyzed. It is shown that wear exponentially increases upon growth of contact pressure and sliding velocity in the homogeneous friction pair polyoxymethylene–polyoxymethylene. In the heterogeneous pair polyetheretherketone–polyoxymethylene the wear of POM is small and exhibits no registered dependence on sliding velocity and contact pressure. Mass-spectrometric analysis shows that the macromolecular decomposition products are not detected for polyetheretherketone–polyoxymethylene pair. However, for thermodynamically compatible polyoxymethylene–polyoxymethylene pair their formation, accompanied by the growth of friction force, is detected already at the levels of friction power as low as 10–2 MPa m/s. These differences have been interpreted to result from interpenetration of polyoxymethylene macromolecules across the interface and their rupture in the shear field in homogeneous polyoxymethylene–polyoxymethylene friction pair and its absence in polyetheretherketone–polyoxymethylene pair. Thermally activated interpenetration of macromolecules for polyoxymethylene–polyoxymethylene pair and its absence in polyetheretherketone–polyoxymethylene pair has been visualized by means of molecular dynamics simulations. The experimental approach and the results of its application will be useful in detailed studies of molecular level friction mechanisms of friction and wear of industrially used polymers and their composites.

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聚甲醛磨损的分子机制
摘要 分析了聚甲醛与聚甲醛和聚醚醚酮摩擦时的摩擦和磨损情况。结果表明,在聚甲醛-聚醚醚酮-聚甲醛的同质摩擦副中,随着接触压力和滑动速度的增加,磨损呈指数增长。在异质摩擦副聚醚醚酮-聚甲醛中,聚甲醛的磨损很小,而且与滑动速度和接触压力没有记录关系。质谱分析表明,在聚醚醚酮-聚甲醛对中没有检测到大分子分解产物。然而,对于热力学相容的聚氧亚甲基-聚氧乙烯对,在摩擦力低至 10-2 MPa m/s 的水平时就能检测到它们的形成,并伴随着摩擦力的增长。这些差异被解释为聚氧化亚甲基大分子在界面上的相互渗透,以及它们在均质聚氧化亚甲基-聚氧化亚甲基摩擦副的剪切场中的断裂,而在聚醚醚酮-聚氧化亚甲基摩擦副中则没有这种现象。通过分子动力学模拟,对聚氧亚甲基-聚氧亚甲基摩擦副的大分子热激活互穿及其在聚醚醚酮-聚氧亚甲基摩擦副中的缺失进行了可视化。该实验方法及其应用结果将有助于详细研究工业用聚合物及其复合材料摩擦和磨损的分子级摩擦机理。
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来源期刊
Journal of Friction and Wear
Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
1.50
自引率
28.60%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.
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