Chemical Bonded PA66-PTFE-Oil Composites as Novel Tribologically Effective Materials: Part 2

Abstract

Polytetrafluoroethylene (PTFE) exhibits excellent non-stick properties and a very low coefficient of friction under tribological stress, but it is incompatible with almost all other polymers. In the first part of this study we presented the generation of the novel tribological material based on unsaturated oil, radiation-modified PTFE (MP1100) and Polyamide 66 (PA66). To get a better understanding of the chemical properties and chemical composition of the compounds, the PA66-MP1100-oil-cb (chemical bonded) compounds were examined by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). In this part, the mechanical properties of the compounds are compared with plain PA66 and PA66-MP1100-cb. The tribological investigation was carried out using the Block-on-Ring tribometer. It was found that the mechanical properties of PA66-MP1100-oil-cb with 20 wt.% MP1100-oil-cb only show slight differences compared to PA66, but the tribological properties of the compounds have been significantly improved through chemical coupling between the three components. Finally, the amount of the compound that was deposited on the surface of the steel disc counterpart was analyzed after the tribological testing.

Chemically bonded PA‐PTFE‐oil compounds by reactive processing: Chemical, thermal, morphological, and mechanical analysis

“…Our previous studies investigated compounds of the combination of PA66‐PTFE and different oils, which were produced via a two‐step reactive extrusion process. The combination PA66, PTFE type MP1100, and methyl oleate oil (MO) provide the lowest coefficient of friction in Pin‐on disc measurements compared to other oil molecules 14,15 . For this reason, MP1100 and MO were selected to be combined with the other two PA‐types in this research: one has better mechanical properties than PA66, and the other exhibits a lower melting temperature, which is advantageous for processing.…”

“…In this research, the compound PA66‐MP1100‐MO‐cb was reproduced and compared with the new PA‐MP1100‐MO‐cb compounds concerning mechanical and morphological properties. The compound materials presented in this article were prepared by reactive processing, which corresponds to our previous study 14,15 . Due to the chemical bonds between PA and PTFE as well as between PTFE and oil molecules, the mechanical properties of the compounds should remain comparable to virgin PA, and the tribological properties should be improved compared to virgin PA, so the compounds could potentially be used as solid lubricants.…”

“…The combination PA66, PTFE type MP1100, and methyl oleate oil (MO) provide the lowest coefficient of friction in Pin-on disc measurements compared to other oil molecules. 14,15 For this reason, MP1100 and MO were selected to be combined with the other two PA-types in this research: one has better mechanical properties than PA66, and the other exhibits a lower melting temperature, which is advantageous for processing. In this research, the compound PA66-MP1100-MO-cb was reproduced and compared with the new PA-MP1100-MO-cb compounds concerning mechanical and morphological properties.…”

Effect of different molding pressures on the properties of glass fiber / molybdenum disulfide / Polytetrafluoroethylene composites

“…8 In addition to having great chemical stability, corrosion resistance, sealing, outstanding non-stick, electrical insulation, and good aging resistance and temperature resistance, PTFE, as a significant polymer material, can operate for an extended period of time in the temperature range of À180°C and 250°C. [9][10][11][12][13][14][15] Many issues in the chemical, petroleum, and pharmaceutical industries have been resolved thanks to the discovery of PTFE. In engineering, PTFE can be formed into tubes, rods, strips, plates, films, and other materials that are typically used in corrosion-resistant pipelines, containers, pumps, valves, radar, high-frequency communication equipment, radio equipment, etc.…”

The crystallinity of chemically bonded PA‐PTFE‐oil compounds by X‐ray diffraction and DSC

“…Compared with other oil molecules, the compound PA66-MP1100-MO-cb (MO: methyl oleate) exhibits the lowest coefficient of friction in pin-on-disc tests. 15,16 MO and MP1100 were combined with two different PA types (PA12 and PA46) in this study. PA46 has better mechanical properties than PA66, and PA12 has a lower melting temperature than PA66, which is advantageous for processing.…”