Abstract
In microcapsule-filled self-healing coatings, a good microcapsule/matrix interface improves repairing performance by directing the crack through the microcapsule and releasing the core material. In this study, the surface of the synthesized linseed oil filled polyurea-formaldehyde (PUF) based microcapsules was treated with 3-aminopropyltrimethoxy silane (APS, via a two-step sol-gel route), in order to improve its interface with an epoxy coating. The treated microcapsules were then characterized using various characterization techniques. The effect of silane treatment on the microcapsule/matrix interface and tensile properties of the coating was evaluated.FTIR spectroscopy showed both physical and chemical interactions between APS and PUF microcapsules. SEM micrographs revealed an almost spherical morphology for both treated and un-treated microcapsules. TGA results showed that the maximum silane grafting occurs at pH 7.5. It was found that the addition of APS-treated microcapsules had a positive effect on the tensile properties of the coating due to improving microcapsule’s shell and polymer matrix compatibility. This was related to the reaction of hydroxyl groups on PUF microcapsules and silanol groups of the silane and the subsequent reaction of amine group of the silane with the epoxy group of the coating.
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