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최상구,손한암,박대환,김진웅 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.6
Herein we introduce a smart Pickering emulsion fluid system, in which associative magnetic nanoparticles (AMNPs) are assembled at the oil?water interface to give magnetic?responsiveness to the emulsion drops. AMNPs are synthesized by grafting hydrophobically modified water?soluble poly(2?methacryloyloxyethylphosphorylcholine?co?stearyl methacrylate) onto silica?coated Fe2O3 nanoparticles (NPs) using surface?mediated living radical polymerization. Use of this synthetic protocol allows us to obtain AMNPs with a hydrophobically associative polymer layer with thickness of a few nanometers. We reveal that the AMNPs not only adsorb effectively on the oil?water interface due to the hydrophobic interaction, but also structurally stabilize the pickering emulsion due to the induction of electrostatic repulsion between droplets. Interestingly, we observe that the flow behavior of AMNPs?stabilized pickering emulsions is kinetically controllable in response to the applied magnetic field, thus demonstrating their practical applicability for magnetic?responsive enhanced oil recovery.
SBR , 폴리우레탄 및 에폭시 라텍스를 혼합한 폴리초산비닐 에멀젼 수지의 점성에 관한 연구
최상구,서원동,박인숙 한국고무학회 1998 엘라스토머 및 콤포지트 Vol.33 No.2
SBR latex, polyurethane latex and epoxy latex were mixed with polyvinyl acetate emulsion in 0∼15%(wt. %). For the mixtures, the viscous properties were examined. The viscosity was influenced by the dispersed phase and the chain structures of polymer, and decreased with the rising of temperatures. The viscosity was increased with mixing of epoxy latex, but decreased with addition of SBR latex or polyurethane latex. Thixotropic index was influenced on the size of micelle and hydrogen bond. The thixotropic index was increased with mixing of epoxy latex or polyurethane latex within 5%, but keep up equality over that. The thixotropic index was decreased with mixing of SBR latex within 5%, but keep up equality over that. The relative viscosity were influnced on the activity of molecule and the interference of dispersed phases, was increased with the rising of temperatures. The relative viscosity was decreased with mixing of epoxy latex, but increased with mixing of SBR latex or polyurethane latex.
고무상 복합물로 표면처리한 실리카를 충전한 에폭시 수지 경화물의 열적 특성
최상구,서원동 한국고무학회 1997 엘라스토머 및 콤포지트 Vol.32 No.1
γ-Glycidoxy propyl trimethoxy silane, CTBN rubber(carboxyl terminated butadiene acrylonitrile rubber) and GMA(glycidyl methacrylate) were reacted on the surface of silica one by one in existence of TEA(triethylamine) or BPO(benzoyl peroxide). The amount of reactant was 2.5∼5.8% of treated silica weight. The treated silica was mixed with epoxy resin and MTHPA(methyl tetrahydro phthalic anhydride) in the range of 0∼60%(wt.%) of total component. The thermal properties were tested for cured products. By using silica treated with silane/rubber or silane/rubber/vinyl, comparing with 3% of rubber mixed directly, it had 13% higher Tg and 10% lower thermal expansion coefficient at 35∼55% of silica contents.
Synthesis of Associative Magnetic Nanoparticles for Recoverable Pickering Emulsion Flooding
최상구,김진웅 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
This study introduces a nanoparticles-stabilized Pickering emulsion system that fabricated by interfacial assembly of associative magnetic nanoparticles (AMNPs). AMNPs are synthesized by chemical grafting of hydrophobically modified poly(2-methacryroyloxyethylphosphorylcholine-co-stearyl methacrylate) (poly(MPC-co-SMA)), in which the surface-mediated seeded living radical polymerization is employed. The hydrophobicity is tuned by the copolymeriation ratio of SMA against MPC. The thickness of polymer layers ranges in a few nanometers. The studies on suspension rheology for the AMNPs show that there are competition between the hydrophobic attraction and the electrostatic and steric stabilization. Also, when the Pickering emulsion is produced using the AMNPs, the flow behavior can be successfully controlled in response to applied magnetic fielld, which nicely demonstrates that this system has great potentials for recoverable emulsion flooding applications.
폴리프로필렌글리콜을 글리콜 성분으로 하는 플리우레탄 수지의 합성 및 물성에 관한 연구
최상구,유길상 한국고무학회 2000 엘라스토머 및 콤포지트 Vol.35 No.3
The polyurethane resin was prepared by the reaction of tolylenediisocyanate(TDI) and polypropyleneglycol(PPG). Physical properties of the resin were investigated experimentally. Charging catalyst before TDI-dropping induced the rapid increase of viscosity. On the other hand, charging catalyst after TDI-dropping resulted in mild stability without immoderate generation of heat on reaction. The use of phosphoric acid as catalyst led to low viscosity by restraining side-reaction such as forming of branch-chain, buret reaction and allopanate reaction, but it showed low cross-link density and slow drying. The curing speed was more influenced by structures of molecules rather than NCO/OH ratio. Including PPG 400 over 30 wt% showed excellent adhesive strength due to increase of crosslink density.
보강섬유의 배향이 고분자 복합재료의 물성에 미치는 효과
崔相久,李和雨,洪錫杓 全北大學校 1993 論文集 Vol.35 No.-
The tensile and flexural strength of unsaturated polyester laminated with 20% glass-fiber(volume %) were tested. Those were compared with its abtained from Holister's equation. The strengths of laminated polyester were mainly depended on the properties of interface between fiber and resin than the strengths of material itself. For crossplied laminates, correct strength coincided with Holister's were not abtained, but could be explained by Holister's theory. The fractural strength of orientation angle 0∼5˚ was influenced by shear resistance besides the strength of glass fiber.