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α - 술폰 지방산 알릴에스테르 올리고머의 합성 및 안료 분산성
이향우(Hyang Woo Lee),권순일(Soon Il Kown),남기대(Ki Dae Nam) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.1
N/A Allylaliphatic carboxylate oligomers were prepared from polymerization giving allyl aliphatic carboxylates in the presence of potassium persulfate in methanol and the α-sulfonation of these allyl aliphatic carboxylates oligomers were carried by direct addition of dry sulfur trioxide. The dispersing performance of oligomer type anionic surfactants and SDS in the aqueous suspension of Fe_2O_3 and Tio_2 particles were evaluated by particle size distribution and ζ-potential measurement. As results, the particles of Fe_2O_3 and Tio_2 were flocculated by addition of small amount of oligomer type anionic surfactants and SDS, then the flocks redispersed by more addition oligomer type anionic surfactants and SDS. The dispersion and flocculation were observed in lower concentration range of oligomer type anionic surfactants than SDS.
당류를 친수기로 한 비이온성 계면활성제계의 상거동 ( 제2보 ) - 슈크로오스 팔미테이트 / 알칸올 / 물 계에서의 상거동 -
이향우,이진희,남기대 ( Hyang Woo Lee,Jin Hee Lee,Ki Dae Nam ) 한국공업화학회 1997 공업화학 Vol.8 No.2
당류를 친수기로 한 슈크로오스 모노팔미테이트에 대한 3성분계 즉, 슈크로오스모노팔미테이트/알칸올/물계에서의 상거동을 각 조성에 따라 조사하였다. 미셀영역에서 여러 액정영역에 이르기까지 각 성분의 조성을 변화시키면서 정온 및 변온하에 여러 상의 구조를 온도조절기와 카메라가 부착된 편광현미경으로 비교관찰하였다. 극성물질인 알칸올의 탄소수 증가에 따른 3성분계에서의 상거동을 관찰한 결과, 헥산올<옥탄올<데칸올 순으로 비교적 넓은 영역에서 비등방성의 여러 액정상이 존재하였으며, 이를 토대로 에멀젼이나 가용화계의 포뮬레이션에 적용할 수 있다. The phase behavior of sucrose monopalmitate/alkanol/water ternary system was investigated. According to compositions of three components ranging from micellar(or inverse micellar) solution up to various lyotropic liquid crystalline(LC) phase, each texture of the separated phases was identified by crossed polarizers equipped with a camera whose stage was connected to a thermostatic circulator. As the carbon atom number in alkanol of the polar oily substance increases, patterns of the various LC phases were also observed hexanol<octanol<decanol in order, and thus could be also applied to formulation of the emulsified or solubilized systems.
이소플라본을 함유한 마이크로에멀젼의 안정성 및 응용 평가
정노희(Noh Hee Jeong),문영진(Young Jin Moon),이향우(Hyang Woo Lee),남기대(Ki Dae Nam) 한국유화학회 2002 한국응용과학기술학회지 Vol.19 No.3
N/A The isoflavone as a derivatives of flavone is colorless crystalline compounds. It acts on synthesis of fibronectine, collagen Ⅲ, collagen Ⅰ in human normal fibroblast by same biological activity to animal hormone. In this study, we tried to search and demonstrate system content rate of dermal translocation system for cosmetics using microemulsion containing isoflavone. The results of microemulsion stability test by centrifugation, storage in incubator and circulation chamber showed that separation of phase did not appear after 30 days. By the skin flexibility test, it has confirmed efficiency and effect as cosmetics materials. As the result, the microemulsion showed that skin flexibility factor improved up to 7.6%. We could confirm that O/W type microemulsion was stable system.
2 - Hydroxyethyl Acrylate 가 아크릴계 점착제의 물성에 미치는 영향
정노희(Noh Hee Jeong),박영준(Young Jun Park),이향우(Hyang Woo Lee),남기대(Ki Dae Nam) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.4
N/A Acrylic pressure sensitive adhesives of n-butyl acrylate, 2-ethyl acrylate, methyl acrylate, vinyl acetate, acrylic acid, acrylonitrile and 2-hydroxyethyl acrylate were synthesized and basic physical properties of pressure sensitive adhesives with increasing the contents of 2-hydroxyethyl acrylate were investigated. 2-Hydroxyethyl acrylates effects on glass transition temperature, viscosity, hardening time and peel strength. Glass transition temperature(Tg) decreased with increasing the contents of 2-hydroxyethyl acrylate. Viscosity and hardening time were increased with increasing the contents of 2-hydroxyethyl acrylate. On the other hands, peel strength increased with increasing the contents of 2-hydroxyethyl acrylate up to 6 wt% and the decreased at further higher contents of 2-hydroxyethyl acrylate. In peel test, interfacial failure was occured in 8 wt% and 10wt%.