| 초록 |
The purpose of this work is to characterize microcapsules with polymeric shells such as urea and melamine by the React FT-IR spectra in the 4000-800 cm-1 wavenumber region. Microcapsules loaded with tetradecane as the core material were prepared by in-situ polymerization methods, where droplets are first formed by dispersing core ingredients into an aqueous phase containing a small fraction of an emulsifier. After emulsification, the melamine-formaldehyde and urea-formaldehyde prepolymers are added and polymeric shells form rapidly around the droplets. The prepolymerization step can be influenced by the various parameters such as the speed of mixing, reaction temperature and mole ratio of the two reactants. Accordingly, experiments were performed under various reaction conditions, and the exchanges of chemical properties in prepolymerization steps were investigated by using the React FT-IR spectroscopy.
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