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Microencapsulated healing agents that possess adequate strength,long shelf-life,and excellent bonding to the host material are required for self-healing materials. The in situ encapsulation method is demonstrated over an order of magnitude size reduction for the preparation of urea-formaldehyde(UF) capsules filled with a healing agent,a mixture epoxy resin of the epoxy 711 and E-51. Capsules with diameters as small as about 100 μm are achieved under the agitation rate of 800 r min-1. The capsules possess a uniform UF shell wall(4 μm average thickness) . By using the analysis of scanning electronic microscope(SEM) ,thermal analysis(TG-DTA) and FTIR,the characteristics of the microcapsules were investigated respectively. Successful self-healing has been demonstrated for anticorrosion covering materials with microcapsules.
The in situ encapsulation method is demonstrated over an order of magnitude size reduction for the preparation of urea-formaldehyde ( UF capsules filled with a healing agent, a mixture of epoxy resin of the epoxy 711 and E-51. Capsules with diameters as small as about 100 μm were achieved under the agitation rate of 800 r min -1. By using the analysis of scanning electronic microscope (SEM), thermal analysis (TG-DTA) and FTIR, the characteristics of the microcapsules were studied respectively. Successful self-healing has been demonstrated for anticorrosion covering materials with microcapsules.