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분산중합 변수가 플리메틸메타크릴레이트의 입자크기에 미치는 영향
우종표(Jong Pyo Wu),김수진(Su Jin Kim) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.4
N/A Monodisperse polymer particles have many industrial applications such as surface coatings for metal panels, chromatographic media, spacers for liquid crystal display panel, and fillers for cosmetics, etc.. Micron-size monodispersed poly(methyl methacrylate) particles were prepared by dispersion polymerization in methanol medium in the presence of poly(vinyl pyrrolidone) and 2,2´ -azobis(isobutyronitrile) as steric stabilizer and initiator, respectively. Effects of polymerization parameters, such as monomer and initiator concentration, stabilizer type and concentration, solvent composition on average particle size and size distribution were studied.
라텍스 입자구조가 필름형성 및 필름물성에 미치는 영향 (2) - 모델 복합 라텍스 입자의 필름형성 거동 -
주인호 ( In Ho Ju ),우종표 ( Jong Pyo Wu ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.2
N/A Film forming behavior of monodispersed model composite latexes with particle size of 190 ㎚, which consist of n-butyl acrylate as a soft phase monomer and methyl methacrylate as a hard phase monomer with different morphology was examined. Five different types of model latexes were used in this study such as random copolymer particle, soft-core/hard-shell particle, hard-core/soft-shell particle, gradient type particle, and mixed type particle. The film forming behavior was evaluated using pseudo on-line measurements of the cumulative weight loss, the UV transmittance, and the tensile fracture energy. Each stages of film formation Ⅰ, Ⅱ were not sensitive to the morphology of model latexes, but stage-Ⅲ was largely dependent on the morphology of model latexes. The chain mobility of polymer which composed the shell component was found to dominantly determine the behavior of film forming stage-Ⅲ.
하이솔리드 도료용 고형분인 아크릴수지의 합성에 관한 연구
양인모(In Mo Yang),우종표(Jong Pyo Wu),박홍수(Hong Soo Park),김성길(Seong Kil Kim) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.4
N/A To prepare an environmental friendly high-solid coatings an acrylic resin containing 80% of solid content was synthesized by addition polymerization of caprolactone acrylate, n-butyl acrylate, ethyl methacrylate, and 2-hydroxyethyl methacrylate. The conversion was 78~93% and the prepared resin`s physical properties are as follows: viscosity, 212~3424cps: M_n 1740~2400. There was a trend that viscosity and molecular weight of the resin increased with Tg, but no direct proportionality was observed
주인호(In Ho Ju),홍진호(Jin Ho Hong),박민석(Min Seok Park),우종표(Jong Pyo Wu) 한국유화학회 2002 한국응용과학기술학회지 Vol.19 No.2
N/A As model waterborne acrylic coatings, mono-dispersed poly(butyl acrylate-methyl methacrylate) copolymer latexes of random copolymer and core/shell type graft copolymer were prepared by seeded multi-staged emulsion polymerization with particle size of 180∼200 nm using semi-batch type process. Sodium lauryl sulfate and potassium persulfate were used as an emulsifier and an initiator, respectively. The effect of particle texture including core/shell phase ratio, glass transition temperature and crosslinking density, and film forming temperature on the film formation and final properties of film was investigated using SEM, AFM, and UV in this study. The film formation behavior of model latex was traced simultaneously by the weight loss measurement and by the change of tensile properties and UV transmittance during the entire course of film formation. It was found that the increased glass transition temperature and higher crosslinking degree of latex resulted in the delay of the onset of coalescence of particles by interdiffusion during film forming process. This can be explained qualitatively in terms of diffusion rate of polymer chains. However, the change of weight loss during film formation was insensitive to discern each film forming stages-Ⅰ, Ⅱ and Ⅲ.
심일우 ( Il Woo Shim ),조혜진 ( Hye Jin Jo ),유혁재 ( Hyuk Jae You ),우종표 ( Jong Pyo Wu ),김명수 ( Myung Soo Kim ),함현식 ( Hyun Sik Hahm ),박홍수 ( Hong Soo Park ),백운필 ( Woon Phil Baik ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.4
N/A An acid cleaning agent (AACA) for aluminum was prepared by blending of sorbitol, n-octanoic acid, MJU-100A, Tetronix T-701, PPA-23, CS-83 and phosphoric acid. With the prepared AACA, degreasing, foam height, etching and derusting tests were carried out. As a result, AACA-4 and AACA-7 showed better cleaning ability than commercial acid cleaning agents.