| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 90 === ABSTRACT
Preparation microcapsules of organic shell in O/W emulsion and inorganic shell in W/O emulsion, we use the O/W/O multiple emulsions to prepare microcapsules of hybrid shell which encapsulate phase-change material. In O/W/O emulsions, the phase-change material(pentadecane) was emulsified as an internal oil phase in a aqueous solution of organic prepolymer, inorganic precursor and Tween 20 prior to emulsification into an external oil phase. In this study, we discuss not only the concentration of Tween 20 and organic prepolymer about stability of O/W/O emulsions but also preparation of organic, inorganic and hybrid microcapsules of particle size, yield and encapsulation. Stability of O/W/O emulsion and particle size observe by microscope. FTIR analyzes microcapsules and DSC measures encapsulation of microcapsules. We observe pictures of SEM to discuss the types and situation of hybrid shell.
To change the concentration of Tween 20 and organic prepolymer, we can successful to prepare microcapsules of hybrid shell which encapsulate phase-change materials. Particle size is from 400μm to 1000μm. Encapsulation is from 40% to 80% and yield is from 8g to 11g. The microcapsules that we prepared measure by FTIR and DSC to prove O/W/O emulsions which can encapsulate phase-change materials and the shell forms by hybrid. There are two types of hybrid shell. One is inner shell formed by inorganic and outer shell formed by organic. The others is to form organic shell first and inorganic shell forms in organic gaps.
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