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폴리비닐아세테이트 Sub-microparticle의 제조 및 특성해석
김한도,Ghim, Han-Do 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.3
Nano-sized poly(vinyl acetate) (PVAc) particles were prepared by emulsification-and-diffusion method. Influences of process variables on the mean particle size of resulting sub-microparticles have been evaluated. It wasclarified that the type and concentration of stabilizer, homogenizer speed, and polymer concentration determined the size of PVAc sub-microparticles. Especially when didodecyl dimethyl ammonium bromide and propylene carbonatewere used as stabilizer and solvent, respectively. PVAc sub-microparticles smaller than 200 nm were obtained.
손광호,김민관,지병철,전경문,김한도,Sohn, Kwang-Ho,Kim, Min-Kwan,Ji, Byung-Chul,Jeon, Kyung-Moon,Ghim, Han-Do 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.2
Flame retarding high impact polystyrene (HIPS) with a reduced amount of halogen flame retardant was prepared by using phosphoric and inorganic flame retardants to improve the shortcomings of the halogen-containing counterparts, such as emission of poisonous gas and environmental pollution. Red phosphorous and metallic flame-retardants were applied for this purpose. Effects of these non-halogen type flame retardants on the thermal and mechanical properties, as well as flame retardancy, of the flame retarding HIPS were examined by thermogravimetric analysis, differential scanning calorimetry, Izod impact strength, and the UL94 flame retardation test.
적린 및 무기계 난연제를 이용한 비할로겐계 난연성 폴리프로필렌의 제조
손광호,김민관,이홍렬,지병철,김한도,Sohn, Kwang-Ho,Kim, Min-Kwan,Lee, Hong-Yeol,Ji, Byung-Chul,Ghim, Han-Do 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.5
Polypropylene (PP) is one of the most widely used materials because of its rational mechanical characteristics. However, the application of PP is significantly limited and infrequent due to its easy combustion and dripping properties. To improve the thermal versatilities of PP, halogen-containing compounds, alone or in conjunction with antimony trioxide, have frequently been used in the flame retarding PPs. Halogen-containing flame retarding agents, however, are supposed to produce corrosiveness, smoke emissions, and toxicity which are combustion products. In this study, red phosphorous, metal oxides, and zinc borate were used as flame retarding agents for PP. The thermal properties of injection-molded PP specimens were characterized by thermogravimetric analysis, differential scanning calorimetry analysis, and UL94 flame retardation tests. Results showed that increased char formation on the surface can confirm flame retardation of the UL94 V0 grade of PP.