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The use of post-mortem Raman spectroscopy in explaining friction and wear behaviour of sintered polyimide at high temperature

机译：事后拉曼光谱在解释高温下烧结聚酰亚胺的摩擦和磨损行为中的应用

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摘要

Due to their thermal stability and high strength, polyimides are an aromatic type of polymer that is used in sliding equipment functioning under high loads and elevated temperature. However, its tribological behaviour under high temperature and atmospheric conditions is not fully understood. It has been reported that a transition from high towards lower friction occurs 'somewhere' in the temperature region between 100℃ and 200℃; however, a correlation with changes in the polyimide molecular structure remains difficult to illustrate and it is not certain whether or not this transition is correlated to lower wear. In the present work sliding experiments under controlled bulk temperatures between 100℃ and 260℃ are performed. A transition is observed in both friction and wear at 180℃ which is further explained by microscopic analysis of the transfer film on the steel counter-face and Raman spectroscopy of the worn polymer surfaces. A close examination of the spectra reveals transitions in relative intensity of certain absorption bands, pointing to different orientation effects of the molecular conformation at the polymer sliding surface at 180℃.
机译：由于它们的热稳定性和高强度，聚酰亚胺是一种芳香族类型的聚合物，可用于在高负载和高温下运行的滑动设备中。但是，其在高温和大气条件下的摩擦学行为尚未完全了解。据报道，在100℃至200℃的温度范围内，某处发生了从高摩擦到低摩擦的转变。但是，与聚酰亚胺分子结构变化的相关性仍然难以说明，并且不确定这种转变是否与较低的磨损相关。在目前的工作中，在100℃至260℃的受控体温下进行了滑动实验。在180℃时，在摩擦和磨损中均观察到转变，这可以通过对钢对接面上的转移膜的显微分析和磨损的聚合物表面的拉曼光谱进一步解释。仔细观察光谱可发现某些吸收带的相对强度发生了转变，这表明在180℃下聚合物滑动表面上分子构象的不同取向效应。

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