Abstract
The 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) was used to synthesize polyimide to introduce different amounts of fluoride to the main chain of polyimide. The infrared spectra indicate that the imidizing process was almost complete and fluorinated monomer was formed in the structure. Fluoride-containing polyimide showed better thermal stability, higher tensile strength, and lower surface energy than neat polyimide. The increase of the fluoride monomer ratio contributed to the tribological properties of polyimide. The friction coefficient decreased with the increase of the fluoride monomer ratio. Surface-free energy and friction heat can alter the physical state of polymer sliding surfaces, and had a great effect on the tribological behaviors. Abrasive wear was designed and executed in this work. The wear rate decreased with the increase of the fluoride monomer ratio.
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