Abstract
In this paper a typical acrylic melamine clearcoat has been modified with hyperbranched polymer and polyhedral oligomeric silsesquioxane nanostructures to simultaneously enhance its scratch resistance and healing ability.
Highlights
Appearance and its retention during service life is an important criterion affecting the overall quality and acceptability of a car body from the customer's view
Paper con rming that the bulk is converted to a tougher material. These results prove that simultaneous incorporation of POSS and hyperbranched polymer (HBP) nanostructures leads to a clearcoat which is more elastic in surface and is tougher in its bulk
It was found that self-healing scratch resistant clearcoats can be obtained via controlling the chemical and physical interactions in the coating network composed of various loadings of modi ers
Summary
Appearance and its retention during service life is an important criterion affecting the overall quality and acceptability of a car body from the customer's view. Weather induced degradation as well as scratches and marring are the most important factors spoiling the automotive coating appearance.[1,2,3] Two main strategies can be implemented to eliminate or diminish the in uence of scratches; scratch prevention and scratch healing.[4,5,6,7,8,9,10,11] The rst includes all strategies which prevent the chance of scratch formation such as increased hardness, slippery surface and toughness–elasticity enhancement of the coating.[6,12,13,14,15] Network reinforcement using increasing crosslinking density or addition of nanoparticles has been the main strategy to enhance the scratch resistance of polymeric coatings The latter covers all extrinsic and intrinsic mechanisms triggered by external stimuli (like heat, pH, incident rays) that restores the deformed scratched areas to its initial state.[9,10,11,16,17,18,19,20] Healing of the scratches may be the last opportunity to ght against the effect of scratches. The healing mechanisms comprise encapsulating the healing agents, incorporation of various reversible covalent and non-covalent
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