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Study on solution-processable yellow host materials for OLED lighting
백용구,남현국,장승희,박상미,윤재홍,이대희,류염나 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
We developed highly efficient solution processable four yellow host materials (YH52, YH54, YH56, and YH65) for OLED Lighting. For developed four yellow hosts, we characterized physical properties of HOMO, LUMO, energy gap, m.p., and Tg, respectively. The Tg values of YH54, YH56, and YH65 were more than 145°C. The device performances of the organic light-emitting diodes(OLEDs) with four yellow host materials (YH52, YH54, YH56, and YH65) as a yellow host layer were investigated. Lifetime of yellow devices were estimated at an initial luminance of 1,000cd/㎡.
키토산 변성 유도체막들의 특성과 용질투과능에 관한 연구
김천호,남현국,정병옥,김재진,최규석 ( Chun Ho Kim,Hyun Gook Nam,Byung Ok Jung,Jae Jin Kim,Kyu Suk Choi ) 한국공업화학회 1995 공업화학 Vol.6 No.3
키토산에 수용성의 비닐계 모노머인 polyethylene glycol monomethacrylate(PEGM)와 dimethylaminoethyl methacrylate(DMAEMA)를 그라프트중합시켜 키토산 변성유도체를 합성하였다. 글루타르알데히드를 사용하여 이 유도체들의 가교막을 제조한 후, 그 열적 안정성과 기계적 물성을 검토하였다. 각 그라프트 중합체의 초기분해온도는 키토산에 비해 낮았으나, 가교막의 경우에는 보다 증가된 수치를 보였다. 기계적 물성은 각 모노머에 대한 그라프트율이 증가할수록 결정성 감소로 인해 낮아지는 경향을 나타내었고, 가교밀도의 증가에 따라서는 향상되었다. 한편, 중합체 가교막의 함수율은 그라프트율이 증가할수록 가교도가 낮을수록 증가하였다. 모델약물로 리보플라빈과 시아노코발아민을 사용한 투과도 측정에서 그 정도가 전적으로 함수율에 의존함으로써 모노머의 그라프트율과 가교도를 조절하여 함수율의 변화를 통해 이들 막의 용질투과능을 제어할 수 있음을 알았다. 그리고, 이들 친수성 고분자 막을 통한 용질의 운송은 고분자와는 상호작용 없이 막내에 존재하고 있는 물의 영역을 통해 이루어지고 있음을 확인하였다. Polyethylene glycol monomethacrylate(PEGM) and dimethyl aminoethyl methacrylate(DMAEMA) were grafted onto chitosan. After crosslinked membranes were prepared using glutaraldehyde with respective graft copolymers producted above, their thermal stability and mechanical properties were investigated. Their initial degradation temperature became higher than that of chitosan and their mechanical properties were improved as the degree of crosslinking increased and they did not become good as the percentage of grafting increased. But water content increased as the percentage of grafting increased and as the degree of crosslinking decreased. For permeability using riboflavin and cyanocobalamine, as model drugs, their solute permeability was able to be controlled through the variation of their water content because the permeation depended entirely upon that. And it was verified that solute permeated through the water region contained in hydrophilic polymer membrane where no interaction between the polymer chains took place.
OLED 조명용 용액 공정이 가능한 황색 호스트 재료의 연구
신철민,남현국,함주석,김종호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We developed highly efficient solution processable Yellow HOST materials (HY-31, HY-32, HY-34 and HY-35) for OLED Lighting. For developed yellow hosts, we characterized physical properties of HOMO, LUMO, energy gap, m.p., and Tg, respectively. The device performances of the organic light-emitting diodes(OLEDs) with yellow host materials as a yellow host layer were investigated.
( Louishamenu ),원정하,이해수,( Latifatu Mohammed ),김광만,박종욱,백용구,남현국,고장면 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In this work, poly[dimethylsiloxane-co-(siloxane-g-acrylate)] (PDMS-A) and lithium-modified silica nanosalt (Li202) are used together as lowtemperature electrolyte additives in lithium-ion batteries (LIBs), taking advantage of the electrochemical and interfacial stabilities due to their surface functional groups. Using these additives together improves the electrochemical stability and ionic conductivity of liquid electrolyte solution to over 5.5 V and 4``10-4Scm-1 at -20°C, respectively. The roomtemperature electrochemical performance of a conventional LIB(LiCoO2/ graphite)is improved by the addition (e.g., initial discharge capacity of 95.9 mAhg-1 obtained after charging at1.0C-rate and consequent discharging at5.0C-rate). The low-temperature performance is also enhanced, achieving a capacity retention ratio of 63.4% after 50cycles at -20°C, compared to 38.7% without the additives.