Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis of Novel Y-type Nonlinear Optical Polyester with Enhanced Thermal Stability of Second Harmonic Generation for Electro-Optic Applications

  • Cho, You-Jin (Institute of Basic Science, Department of Chemistry, Inje University) ;
  • Lee, Ju-Suk (Institute of Basic Science, Department of Chemistry, Inje University) ;
  • Lee, Ju-Yeon (Institute of Basic Science, Department of Chemistry, Inje University)
  • Received : 2009.09.25
  • Accepted : 2010.04.14
  • Published : 2010.06.20
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Abstract

Methyl 3,4-di-(2'-hydroxyethoxy)benzylidenecyanoacetate (3) was prepared and condensed with terephthaloyl chloride to yield novel Y-type polyester (4) containing 3,4-dioxybenzylidenecyanoacetate groups as NLO-chromophores, which constituted parts of the polymer main chains. The resulting polymer 4 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. Polymer 4 shows thermal stability up to $280^{\circ}C$ in thermogravimetric analysis with glass-transition temperature obtained from differential scanning calorimetry near $105^{\circ}C$. The second harmonic generation (SHG) coefficient ($d_{33}$) of poled polymer films at the 1064 nm fundamental wavelength is around 2.42 pm/V. The dipole alignment exhibits high thermal stability up to near $T_g$, and there is no SHG decay below $100^{\circ}C$ due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.

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References

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