One-component intrinsic self-healing coatings based on reversible crosslinking by diels-alder cycloadditions

摘要

Terpolymers containing functional moieties for reversible crosslinking by DA reaction are synthesized for application as self-healing coatings. The polymers are based on a methacrylate backbone containing furan as well as maleimide units in the side chains. No additional crosslinker is required to obtain a self-healing polymeric material. After damage, the material can be heated to a temperature at which the retro-DA reaction takes place. Subsequent cooling to room temperature leads to a healing of the scratch due to the coupling of the two reactive functional groups. This healing process can be repeated multiple times. The polymers are characterized by means of ~1H NMR spectroscopy, size-exclusion chromatography, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, thermogravimentric analysis, and differential scanning calorimetry. The self-healing properties are studied using atomic force microscopy, scanning electron microscopy, and nanoindentation.