UV-cured hybrid organic–inorganic Layer by Layer assemblies: Effect on the flame retardancy of polycarbonate films

摘要: In the present work, UV-curable layers have been exploited for assembling hybrid organic–inorganic Layer by (LbL) coatings, able to enhance thermo-oxidative stability and flame retardancy of polycarbonate (PC) films (500 μm thick). More specifically, 5 or 10 quad-layers (QL), each consisting a branched polyethylene imine, negative silica nanoparticles (average diameter: 30 nm), positive alumina-coated 10 nm) acrylic aliphatic polyurethane resin assembled on PC films. The obtained architectures eventually exposed UV radiation in order crosslink them study their durability washing treatments concentrated ammonia solution. Scanning electron microscopy has shown that UV-curing process allows forming continuous homogeneous coating, as compared un-cured counterpart. addition, UV-cured 10QL turned out be capable protect from application methane (3s) suppressing dripping, smoke release particulate formation. These coatings proven still efficient also when samples washed at 50 °C 1 h deionized water. Indeed, same performances observed such horizontal spread tests repeated after washing, thus demonstrating features these LbL architectures. best results achieved least 5QL deposited substrate subjected UV-curing. Thus, combination assembly may represent an effective way obtaining durable retardant coatings.