Microcapsules containing a glycidyl ester-type epoxy resin were successfully synthesized by in situ polymerization, with poly(melamine-urea-formaldehyde) as the shell material and diglycidyl 1,2-cyclohexanedicarboxylate (DGCHD) as the core substance. Scanning electron microscopy was performed to investigate the surface morphology and shell wall thickness of the microcapsule. The fabrication, diameters and thermal decomposition behavior of the resultant microcapsules were studied by means of Fourier transform infrared spectroscopy, laser particle size analysis, and thermogravimetric analysis (TGA), respectively. Results indicated that the highest loading of DGCHD in the as-prepared microcapsules was about 89.1 wt.% and that the mean diameter of the capsules was in the range of 50–130 μm, which can be adjusted by changing the feeding mass ratio of the core/shell material and emulsifying rate, respectively. TGA results showed that the microencapsulated DGCHD degraded in two distinguishable stages.
Abstract.A new type of epoxy composite with self-healing functionality was successfully developed in this work. Self-healing is achieved via embedded microcapsules containing diglycidyl 1,2-cyclohexanedicarboxylate(DGCHD)and microcapsules containing modified aliphatic amine(HB-1618) hardener. This paper also investigated the preparation and properties of curing agent microcapsule which was prepared by the solvent evaporation method. Recovery of impact strength is assessed through izod notched impact testing for impact specimens. It was found that the content of both microcapsules largely influenced the healing efficiency at a certain range. As a result, the optimal filling contents of epoxy-containing microcapsules and hardener-containing microcapsules embedded in the epoxy matrix are 6 wt. % and 9 wt. %, offering a ~65.6% healing efficiency. Scanning electron microscope (SEM) photos of fracture surface before and after healing process proved that the healing process was successfully realized.
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