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멜라민 - 포름알데히드를 이용한 in situ 중합에 의한 마이크로캡슐 제조공정
이재구,신도근,성준희,김재구 한국공업화학회 1999 응용화학 Vol.3 No.1
A microencapsulation process with in-situ polymerization has been studied by using an anionic water-soluble polymer for microencapsulated phase change materials. As the phase change material inside capsule wall adsorb a large quantity of heat when it changes from solid to liquid state, it is very useful for the enhanced thermal management such as heat transport and storage. The condensation reaction of MF pre-condensate followed by emulsification is initated by lowering the pH of the emulsion. As the portion of MF precondensate is increased in the external medium with the reaction step, the majority of the MF condensate around the internal phase droplet to form thick, hard microcapsule wall. In this study, we have found that the various condition in microencapsulation process with MF by in situ polymerization affects on the characteristics of products.
폴리솔베이트 비이온성계면활성제를 함유한 3성분계의 상거동
정진기,신도근,이진희,남기대 ( Jin Gi Jeong,Do Keun Shin,Jin Hee Lee,Ki Dae Nam ) 한국공업화학회 1997 공업화학 Vol.8 No.4
폴리솔베이트-헥산올-물의 3성분계의 상거동에 관한 메커니즘을 조사한 것으로, 등방성인 미셀영역에서 비등방성인 모자이크형 액정상을 편광현미경에 의해 관찰하였다. 액정상 및 다른 상들은 약 20∼70wt% 범위에서 관측되었으며, 이 영역에서는 보다 안정한 유화계나 분산계의 포뮬레이션에 대한 기본적인 데이터를 제공할 수 있다. 알킬기의 탄소수 증가에 따라 3상 영역이 감소한 반면에, 2상 영역이 증가되었으며 비등방성 액정상은 관찰되지 않았다. In this study, the mechanism on the phase behavior of polysorbate nonionic surfactants was investigated. In the ternary system containing water, hexanol as a polar oil and surfactant, the phase behaviors ranging from micellar region to occurrence of liquid crystal phase were observed by a crossed microscope. As results, fine mosaic texture of liquid crystal phase and other phases were examined in the range of 20∼70 wt%. This range is thought to give information about the basic data for the formulation of more stable emulsifying systems or dispersed systems. According to the alkyl chain length, three phase region diminished, whereas two phase range increased without an observation of the anisotropic liquid crystalline phase.