• Title/Summary/Keyword: Engineering polymer

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Synthesis and Characterization of Poly(fluorenylenevinylene-terphenylenevinylene) Containing Phenyl Pendant Group

  • Kim Yun-Hi;Jung Sung-Ouk;Lee Kwang-Hoi;Kwon Soon-Ki
    • Macromolecular Research
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    • v.14 no.1
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    • pp.81-86
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    • 2006

  • Poly(fluorenylenevinylene-terphenylenevinylene) containing phenyl pendant group was synthesized by Suzuki coupling reaction and characterized by ${1}^H$-NMR, ${13}^C$-NMR, and IR-spectrum. The weight average molecular weight ($M_{w}$) of the obtained polymer was 31,000 with a polydispersity index of 1.9. The polymer showed good solubility in common organic solvents, and the solution and film emitted blue emission ($\lambda_{max}$=460 nm) on irradiation with UV light. The ITO/PEDOT/polymer/Al device fabricated using the polymer as an emitting layer emitted blue light with a maximum peak around 460 nm. The maximum efficiency of the device was 0.011$\%$.

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Realization of Optically Compensated Bend State using Surface Polymer Stabilization

  • Jeon, E.J.;Kang, B.G.;Kwon, D.W.;Lim, Y.J.;Lee, M.H.;Lee, S.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.657-660
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    • 2009

  • Optically compensated bend (OCB) mode has intrinsic characteristics such as wide viewing angle and fast response time. However, in order to operate the OCB mode in bend state, this device needs quick transitions from the initial splay state to bend state. In this paper, we proposed OCB mode with initially bend state using reactive mesogen (RM) monomer for surface polymer stabilization. The device shows continuous reorientation of the LC with applied field and a very fast response time.

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Synthesis and Characteristics of New Poly(p-phenylenevinylene) with Bulky t-Octylphenoxy Group

  • Kim, Yun-Hi;Lee, Hyun-Ouk;Jung, Sung-Ouk;Kwon, Soon-Ki
    • Macromolecular Research
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    • v.11 no.3
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    • pp.194-197
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    • 2003

  • A new 2,5-di(t-octylphenoxy) group substituted poly(p-phenylenevinylene) derivative was synthesized by Gilch polymerization. The obtained polymer was characterized by NMR, FT-IR, and chemical analysis and completely soluble in common organic solvents. The polymer showed good thermal stability with T$_{g}$ of 105$^{\circ}C$. The polymer dissolved in chloroform showed maximum emission at 514 nm with a shoulder peak at around 560 nm. The EL spectrum of the ITO/PEDOT/TOP-PPV/Al device was observed maximum emission at 545 nm with a shoulder peak at around 585 nm.m.

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