Abstract
Samples of fluoropolymers were blended with a commercial epoxy at 5 to 50 wt.% of fluoropolymer content and also with a so-called thermoplastic epoxy (BLOX). Pure epoxy samples were studied for comparison. Scratch depths and viscoelastic recoveries were determined within±7.5 nm with a Swiss Micro-Scratch Tester; scanning electron microscopy (SEM) was also performed. Significant improvements in the original scratch penetration depth and in the scratch healing as compared to the pure epoxies are demonstrated. The extent of the improvement depends on the chemical structures of the fluoropolymers, nanoscale structure of the surface, the presence and concentration of electronegative atoms, and the presence and concentration of carbonyl and phenylene groups. A structural description of the fluoropolymers is provided on atomistic modeling.
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