Microcapsules reinforced polymeric smart coatings

摘要

Novel smart coatings were developed by reinforcing polymeric matrix with polyelectrolyte multilayered microcapsules. Towards this direction, urea formaldehyde microcapsules encapsulated with linalyl acetate (UFMCs), were synthesized by in situ emulsion polymerization technique. Dodecylamine (DOC), working as a pH stimulus corrosion inhibitor, was deposited into layers of polyelectrolyte layers of polyethylenimine (PEI) and sulfonated polyether ether ketone (SPEEK). The polymers were coated layer by layer over the microcapsules (MLUFMCs). MLUFMCs and UFMCs were thoroughly dispersed into the epoxy resin to coat on the steel substrate to form smart coatings. A comparison of the structural, thermal and anticorrosive properties indicates that coatings modified with multilayered capsules (PMLSCs) demonstrate good thermal stability, improved self- healing characteristics and higher corrosion resistance compared to the coating modified with urea formaldehyde microcapsules (SLSCs). The improved properties of PMLSCs can be attributed to efficient release of the encapsulated self-healing agent and corrosion inhibitor from the MLUFMCs. Therefore, epoxy coatings modified multilayered capsules may be attractive for corrosion protection of steel parts used in oil & gas industries.