• Title/Summary/Keyword: Styrene Oxide

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Indium Tin Oxide-Free Large-Area Flexible Organic Light-Emitting Diodes Utilizing Highly Conductive poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) Anode Fabricated by the Knife Coating Method (나이프 코팅 법으로 제작한 ITO-Free 고전도성 PEDOT:PSS 양극 대면적 유연 OLED 소자 제작에 관한 연구)

  • Seok, JaeYoung;Lee, Jaehak;Yang, MinYang
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.1
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    • pp.49-55
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    • 2015
  • This paper reports solution-processed, high-efficiency organic light-emitting diodes (OLEDs) fabricated by a knife coating method under ambient air conditions. In addition, indium tin oxide (ITO), traditionally used as the anode, was substituted by optimizing the conductivity enhancement treatment of poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films on a polyethylene terephthalate (PET) substrate. The transmittance and sheet resistance of the optimized PEDOT:PSS anode were 83.4% and $27.8{\Omega}/sq$., respectively. The root mean square surface roughness of the PEDOT:PSS anode, measured by atomic force microscopy, was only 2.95 nm. The optimized OLED device showed a maximum current efficiency and maximum luminous density of 5.44 cd/A and $8,356cd/m^2$, respectively. As a result, the OLEDs created using the PEDOT:PSS anode possessed highly comparable characteristics to those created using ITO anodes.

Synthesis of Poly(styrene carbonate) (Poly(styrene carbonate)의 합성)

  • Lee Yoon Bae;Ryoo Kunkul;Lee Jongkwon;Lee Miyoung;Sung Sichang;Shin Eunjung
    • Proceedings of the KAIS Fall Conference
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    • 2004.11a
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    • pp.269-271
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    • 2004
  • 최근 지구의 온난화를 가속시키고 있는 온실가스(Greenhouse gas)가운데 하나인 $CO_2$와 Styrene Oxide를 Methylene chloride에서 Zinc Glutarate를 촉매로 하여 800-1000ps1, $75^{\circ}C$에서 반응시켜 Poly(styrenecarbonate)(PSC)를 합성하였다. 합성된 고분자는 FT-IR과 H-NMR, C-NUR로 분석하였다.

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Nanofiller as Vulcanizing Aid for Styrene-Butadiene Elastomer

  • Sahoo, N.G.;Das, C.K.;Panda, A.B.;Pramanik, P.
    • Macromolecular Research
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    • v.10 no.6
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    • pp.369-372
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    • 2002
  • The use of ZnO and stearic acid is very well known in sulfenamide accelerated sulfur vulcanization of diene elastomers. Zn-ion coated nano filler has been developed and tested, in styrene-butadiene rubber (SBR) as sulfur vulcanizing activator cum reinforcing filler. In this study Zinc oxide has been replaced by the Zn-ion coated nano silica filler with an aim to study the dual role of this nanofiller in SBR. The presence of Zn-ion on the nano silica filler surface activates the sulfur vulcanization by involving Zn++ in to the sulfurating complex formed with thiazole from sulfenamide. The increase of Zn-ion, on the nanofiller, decrease the scorch safety of the elastomer compound but increase the tensile strength, state of cure and tear strength and attain maximum at its 10% level. The presence of stearic acid increases the rate of vulcanization. Replacement of stearic acid with mono-stearate, however, increases the vulcanization rate but decrease the ultimate state of cure. A mechanistic scheme involving dual function of this nanofiller has been suggested.

Effect of the Hydrophobicity of Hybrid Gate Dielectrics on a ZnO Thin Film Transistor

  • Choi, Woon-Seop;Kim, Se-Hyun
    • Transactions on Electrical and Electronic Materials
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    • v.11 no.6
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    • pp.257-260
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    • 2010
  • Zinc oxide (ZnO) bottom-contact thin-film transistors (TFTs) were prepared by the use of injector type atomic layer deposition. Two hybrid gate oxide systems of different polarity polymers with silicon oxide were examined with the aim of improving the properties of the transistors. The mobility and threshold voltage of a ZnO TFT with a poly(4-dimethylsilyl styrene) (Si-PS)/silicon oxide hybrid gate dielectric had values of 0.41 $cm^2/Vs$ and 24.4 V, and for polyimide/silicon oxide these values were 0.41 $cm^2/Vs$ and 24.4 V, respectively. The good hysteresis property was obtained with the dielectric of hydrophobicity. The solid output saturation behavior of ZnO TFTs was demonstrated with a $10^6$ on-off ratio.

Magnetic Properties of NiZn-ferrite Synthesized from Waste Iron Oxide Catalyst (산화철 폐촉매로부터 합성된 NiZn- 페라이트의 자기적 특성)

  • Hwang, Yeon;Kwon, Soon-Kil;Lee, Hyo-Sook;Je, Hae-June;Park, Sang-Il
    • Journal of the Korean Ceramic Society
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    • v.38 no.12
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    • pp.1162-1166
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    • 2001
  • NiZn-ferrite was synthesized from waste catalysts, which were produced from styrene monomer process and buried underground as an industrial wastes, and its magnetic properties were investigated. Nickel oxide and zinc oxide powders were mixed with finely ground waste catalysts, and spinel type ferrite was obtained by calcination at 900$\^{C}$ and sintering at 1230$\^{C}$ for 5 hours. The intial permeability was measured and reflection loss was calculated from S-parameters for the composition of Ni$\_$x/Zn$\_$1-x/Fe$_2$O$_4$(x=0.36, 0.50, 0.66). NiZn-ferrite synthesized from waste iron oxide catalyst showed a feasibility for the use as electromagnetic wave absorber in X-band.

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Synthesis of NiZn-Ferrite from Waste Iron Oxide Catalyst (산화철 페촉매를 애용한 NiZn-페라이트의 합성)

  • Hwang, Yeon;Lee, Hyo-Sook;Lee, Woo-Chul
    • Korean Journal of Crystallography
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    • v.12 no.1
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    • pp.20-24
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    • 2001
  • NiZn-ferrite was synthesized usign waste iron oxide catalysts which were produced from styrene monomer process and buried underground as an industrial wastes. The spinel type ferrite was obtained by calcination and sintering of the mixture of finely ground waste catalysts, nickel oxide and zinc oxide powders. The sintered body of Ni/sub 0.5/Zn/sub 0.5/Fe₂O₄ composition at 1230℃ for 5 hours showed the density of 5.38g/㎤, and initial permeability of 59 at 1 kHz. Not only cerium oxide, which existed as a major component in the catalyst, but also unicorporated NiO and ZnO into spinel structure remained as second phases after sintering.

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Assay of Epoxide Hydrolase Activity Based on PCR-linked in vitro Coupled Transcription and Translation System. (무세포 단백질합성 시스템 기반의 epoxide hydrolase 발현 및 활성 분석)

  • Lee, Ok-Kyung;Kim, Hee-Sook;Lee, Eun-Yeol
    • Journal of Life Science
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    • v.15 no.5 s.72
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    • pp.779-782
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    • 2005
  • Cell-free expression is a powerful tool for rapid protein analysis, enabling an efficient identification of gene without cumbersome procedure of transformation and cell culture. Epoxide hydrolase (EH) gene of Rhodotorula glutinis was simply amplified by PCR, and the resultant gene was expressed in vitro using a coupled Transcription/translation system. The cell-free expressed EH protein mixture exhibited the enantioselective hydrolysis activity toward (R)-styrene oxide, representing that cell-free protein synthesis system can be used for the rapid expression of an enantioselective enzyme for an efficient identification of the chiral activity.