| 초록 |
Microcapsules containing phase change materials (PCMs) adsorb a large quantity of heat when core materials change from solid to liquid state. In this current study, octadecane was selected as a core material and encapsulated for the application to thermoregulating materials. PCM capsules were synthesized via in-situ polycondensation method using melamine-formaldehyde as a wall material. In the 1st step, octadecane emulsion was prepared via direct emulsification method using homogenizer and stabilized with nonionic surfactant. In the 2nd step, melamine and formaldehyde were pre-polymerized under existing of octadecane emulsion prepared at 1st step. The capsule morphology was controlled by shell ratio to the core materials and the 2nd surfactant’s concentration. After 4 hr reaction, pH 6.0, the bridging reaction proceeds and methylene and ether bridges were observed and the quantity of octadecane was also increased at this point, but on the other hand, M-F was comparatively decreased because octadecane was encapsulated. As a result, it is cleared that the capsule formation was started after 4hr reaction at pH 6.0. In the application, the fabrics, such as the cotton, polyester etc. were blended with the microcapsules under various conditions with curing temperature/time and concentration by Screen Printing Method(SPM).
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