Preparation of Polymer Microcapsules Encapsulated Fragrance by Pickering Emulsion Technique
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Abstract
In this research, the preparation of polymethyl methacrylate-co-ethylene glycol dimethacrylate) (PMMA-co-EGDMA)) microcapsules encapsulated methyl anthranilate as a fragrance model by microsuspension polymerization was studied. The monomer droplets were prepared by pickering emulsion method using zinc oxide nanoparticles as a particulate stabilizer. The ratios of monomers: MA, MMA: EGDMA and initiator concentration were investigated. From the experimental result, it was found that using monomers: methyl anthranilate of 70: 30, MMA: EGDMA of 50: 50 and initiator concentration of 8 wt% of monomers was an optimum condition for the preparation of microcapsule. The high colloidal stable spherical microcapsules were prepared without the formation of free polymer particles in an aqueous medium. The rough surface microcapsules due to the presence of zinc oxide nanoparticles as a particulate stabilizer distributed on microcapsule surface were successfully prepared. The encapsulation efficiency of methyl anthranilate in microcapsules was high up to approximately 100 %. When such optimum condition was applied for the encapsulation of commercial fragrance, the stable microcapsules with high encapsulation efficiency were obtained as well.
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