فهرست نشریات علمی دسترسی آزاد ایران

In this work, self-healing materials employ nano/microencapsulation, with a core consisting of Schiff base and a shell made of poly melamine urea formaldehyde (PMUF), synthesized through emulsion polymerization employing redox initiators at low temperatures. These microcapsules were created with various sizes and inhibitor contents, utilizing emulsion polymerization parameters. Schiff-base Synthesized through a series of meticulously controlled steps Chitosan, 1.0 g with 15 mL of deionized water, 1 mL of acetic acid, Cinnamaldehyde, 4.5 mL, and ethanol, 1 mL, was mixed for 30 minutes at 50°C and 600 rpm, yielding a white solution. The addition of (7.5,15 mL of 1.0 M NaOH) to the solution to adjust PH leads to three products code A, B, and C. 100 mL of deionized water and 3.1 gr of surfactant (5.0 gr of Tween 40 + 5.0 gr of Tween 80) for Production of Solution Phase. Then 2.11 cc formaldehyde was mixed with 3.5518 gr of urea, 0.6352 gr of melamine, and 0.2805 gr of ammonium sulfate to Produce of Capsule Phase. 25.08 gr of ammonium chloride and 25.02 gr of resorcinol were mixed with 50 cc of deionized water at 200 rpm. Then, the pH was adjusted to 9.2 using 33% HCl of microcapsules containing Schiff-base. Schiff-base microcapsules were successfully synthesized and characterized, demonstrating stable and uniform properties with effective synthesis confirmed by FTIR, XRD, SEM, FE-SEM, and EDS results. This type of microcapsules improves the performance and durability of coatings.