• Title, Summary, Keyword: Polymer precursor

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A Study on Electroluminescence Device with Polymer (고분자를 이용한 전계발광소자에 관한 연구)

  • Lee, Jong-Chan;Lee, Cheong-Hak;Park, Su-Gil;Lim, Kee-Joe;Park, Dae-Hee
    • Proceedings of the KIEE Conference
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    • pp.1219-1221
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    • 1997
  • Poly(1,4-phenylene(1-methoxyenthylene)), organic water soluble PPV precursor was synthesized for polymer electroluminescence(EL) device. To control the molecular array, deposition method of emitter was Langmuir-Blodgett(LB). PPV precursor layer was treated thermally to conversion of PPV. Optical, electrical and EL properties of PPV LB thin film was estimated. Homogeneous light emission of greenish-yellow in PPV LB thin film can be easily confirmed under normal lighting even at low driving voltage. Polymer EL device using PPV LB thin film as emitter materials had a possibility to apply to next generation display device.

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Green Light-emitting diode using a germyl-substituted PPV derivative

  • Hwang, Do-Hoon;Lee, Jeong-Ik;Cho, Nam-Sung;Shim, Hong-Ku
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.582-584
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    • 2004
  • The light-emitting properties of poly(2-triethylgermyl-1,4-phenylenevinylene) (TEG-PPV) are compared with those of the silyl-substituted PPV homologue, poly(2-trimethylsilyl-1,4phenylenevinylene) (TMS-PPV). The precursor polymer is solution-processable. After carrying out thermal elimination on the precursor polymer film, the resulting fully conjugated polymer film was found to exhibit high thermal stability in air, and absorption that is shifted to the longer wavelength region owing to the extension of the n-conjugated system. TEG-PPV exhibits efficient green light emission; the maximum PL emission of a TEG-PPV thin film was found to be at 515 nm. The HOMO and LUMO energy levels were also determined using photo-emission spectroscopy. The performance of the TEG-PPV EL device was found to be comparable to that of the TMS-PPV device.

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Investigate Electronic Property of N-doped Plasma-Polymer Thin Films for Applied Biosensors

  • Seo, Hyeon-Jin;Hwang, Gi-Hwan;Nam, Sang-Hun;Ju, Dong-U;Lee, Jin-Su;Yu, Jeong-Hun;Bu, Jin-Hyo;Yun, Sang-Ho
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.159-159
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    • 2013
  • In this studying, we investigated the basic properties of N-doped plasma polymer. The N-doped plasma polymer thin films were deposited by radio frequency (13.56 MHz) plasma-enhanced chemical vapor deposition method. Various carbon-source were used as organic precursor with hydrogen gas as the precursor bubbler gas. Additionally, ammonia gas [NH3] was used as nitrogen dopant. The as-grown polymerized thin films were analyzed using cyclic voltammetry, ellipsometry, Fourier-transform infrared [FT-IR] spectroscopy, Raman spectroscopy, FE-SEM, and water contact angle measurement. Electronic property of N-doped plasma thin film is changed as flow rate of the NH3 gas.

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Carbon Molecular Sieve Membranes Derived from Thermally Labile Polymer Containing Polyimide and Their Gas Separation Properties (열분해성 고분자 도입에 따른 탄소분자체막의 기체 투과 특성)

  • Young Moo Lee;Youn Kook Kim;Ji Min Lee;Ho Bum Park
    • Membrane Journal
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    • v.13 no.3
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    • pp.182-190
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    • 2003
  • Carbon molecular sieve (CMS) membranes were prepared by the pyrolysis of polyvinylpyrrolidone containing polyimide precursors. We have prepared the polymer precursors, pyrolyzed polymer and investigated the effect of pyrolyzing polymer on the characteristics of carbon structures and gas separation properties of the CMS membranes. Thermogravimetric analysis (TGA) showed the two-step decomposition of polymer precursor. First decomposition of the pyrolyzing polymer began around $400^{\circ}C$ while carbonizing polymer showed the decomposition around $550^{\circ}C$. The gas permeabilities through the CMS membranes were enhanced by the introduction of the pyrolyzing polymer and decreased with increased final pyrolysis temperature. The CMS membrane pyrolyzed at $550^{\circ}C$. derived from precursor containing 5wt% PVP as a pyrolyzing polymer showed gas permeability for $O_2$ of 808 Barrers [$10^{-10}cm^3 (STP)cm/cm^2scmHg]$ and $O_2/N_2$ selectivity of 7.

Preparation of Valuable Compounds Encapsulated Polymer Nanoparticles with High Payload Using Core-crosslinked Amphiphilic Polymer Nanoparticles (코아 가교 양친성 고분자 나노입자를 이용한 고함량 유용 약물 담지 고분자 나노입자 제조)

  • Kim, Nahae;Kim, Juyoung
    • Applied Chemistry for Engineering
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    • v.27 no.1
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    • pp.26-34
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    • 2016
  • In this study, core-crosslinked amphiphilic polymer (CCAP) nanoparticles prepared using a reactive amphiphilic polymer precursor (RARP) were used for preparing some valuable compounds encapsulated polymer nanoparticles with high payload through nanoprecipitation process. Various solvents (acetone, ethanol, and THF) having different polarity and CCAP nanoparticles prepared using different amphiphilicity were used for the preparation of ${\alpha}$-tocopherol encapsulated polymer nanoparticles to investigate their effects on the encapsulation efficiency, payload, nanoparticle size, and stability. CCAP dissolved in hydrophobic solvent, THF, could form ${\alpha}$-tocopherol encapsulated polymer nanoparticles dispersed in water with the high payload of ${\alpha}$-tocopherol and encapsulation efficiency. Because of their physically and chemically robust nano-structure originated from crosslinking of the hydrophobic core, CCAP nanoparticles could encapsulate ${\alpha}$-tocopherol with the high payload (33 wt%) and encapsulation efficiency (97%), and form 70 nm-sized stable nanoparticles in water.

Preparation of Cu-MgO catalysts with different copper precursors and precipitating agents for the vapor-phase hydrogenation of furfural

  • Sadjadi, Samahe;Farzaneh, Vahid;Shirvani, Samira;Ghashghaee, Mohammad
    • The Korean Journal of Chemical Engineering
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    • v.34 no.3
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    • pp.692-700
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    • 2017
  • This article presents the effects of three copper precursors and four precipitating agents on the catalytic performance of the corresponding co-precipitated Cu-MgO catalysts in the vapor-phase hydrogenation of furfural. The chemical and physical properties were analyzed by means of XRD, BET, SEM, and EDX techniques. The nitrate precursor provided the highest performance (conversion of ~89%). Whereas, the catalyst prepared with NaOH was the most efficient (furfuryl alcohol yield of >90%) during 240 min; the most durable conversion (~95%) was assured with $Na_{2^-}$ $CO_3$, and the highest selectivity to furfuryl alcohol (>97%) was achieved with $K_2CO_3$ as the precipitating agent. The least efficient catalyst (prepared with ammonium carbonate) led to 5-methylfurfural and 2,2-methylenebisfuran as the main byproducts. The major byproducts over the rest of the catalysts included tetrahydrofurfuryl alcohol, furfuryl ether, 1-pentanol, and 2-methylfuran. An increasing trend of furfuryl alcohol selectivity with time-on-stream was evident for all of the catalysts.

Fabrication of Porous Ceramics and Multi-layered Ceramics Containing Porous Layers; I. Pore Structure (다공성 세라믹스와 다공질층을 포함하는 적층체의 제조에 관한 연구;I. 기공구조)

  • 이해원;윤복규;송휴섭
    • Journal of the Korean Ceramic Society
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    • v.31 no.9
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    • pp.1044-1052
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    • 1994
  • Tape casting technique was successfully applied to produce porous ceramics and multi-layered ceramics containing porous layers, where spherical hollow polymer particles were introduced as pore precursors. In the presence of extreme differences in density and size between Al2O3 and pore precursor particles, hindered settling was effective in preventing segregation of component particles and packing behavior of mixed powders was improved through bimodal packing. There were two transitions in packing behavior of mixed powders. The first transition took place at 40~50 vol% pore precursor addition, where majority of pores changed from close to open pore state. The other transition occured at 60~70 vol% pore precursor addition, where pore precursor particles formed a continuous network structure.

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Preparation of Si(Al)ON Precursor Using Organoaluminum Imine and Poly (Phenyl Carbosilane), and the Compositional Change of the Film with Different Heat Treatment Condition

  • Lee, Yoonjoo;Shin, Dong-Geun;Kwon, Woo Teck;Kim, Soo Ryong;Kim, Younghee
    • Journal of the Korean Ceramic Society
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    • v.52 no.4
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    • pp.243-247
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    • 2015
  • Si(Al)ON precursor was synthesized by formation of new Si-N bond using organoaluminum imine and liquid type poly(phenyl carbosilane). It was decomposed between $200-600^{\circ}C$, and the ceramic yield was 51% after pyrolysis. 150 - 200 nm in thickness of coating film was obtained by spin coating method. The precursor was easily oxidized during process because it was unstable in air. However the oxygen content was limited to 0.5 - 0.7 to silicon in heat treatment step. Even though the content of nitrogen was decreased by pyrolysis, Al-N and Si-N bonds were formed in ammonia atmosphere, and Si(Al)ON film was formed with 0.2 in content to silicon.

CHEMISTRY, PHYSICS AND TECHNOLOGY FOR NEW LIQUID CRYSTAL DISPLAYS

  • Penterman, Roel;Klink, Stephen I.;Koning, Henk de;Vogels, Joost;Huitema, Edzer;Broer, Dirk J.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.273-276
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    • 2003
  • Polymerization induced diffusion has been successfully applied to create new display components. Based on this principle a new technique to produce polymer covered liquid crystal layers on a single substrate, called photo-enforced stratification, allows cost-effective production of ultra-thin LCDs. The two-step photopolymerization-induced phase separation of a liquid crystal and a polymer precursor can be performed on a variety of substrates and provides freedom in display design.

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Synthesis of Pentiptycenediacetylene (Pentiptycene Diacetylene의 합성)

  • Han, Joungmin;Kwon, Hyungjun
    • Journal of the Chosun Natural Science
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    • v.2 no.2
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    • pp.69-72
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    • 2009
  • Pentiptycenediacetylene is very useful precursor materials for the synthesis of conducting polymer materials. The incorporation of rigid three-dimensional pentiptycene moieties into conjugated polymer backbones would offer several design advantages. They prevent ${\pi}$-stacking of the polymer backbones and thereby maintain high fluorescence quantum yields and spectroscopic stability in thin films. The pentiptycenediactylene was synthesized and characterized by 1H- and 13C-NMR spectroscopy.

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