Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Properties of Novel Y-type Nonlinear Optical Polyester Containing Cyanovinylthiophene with Enhanced Thermal Stability of Second Harmonic Generation

  • Lee, Ga-Young (Institute of Basic Science, Department of Chemistry, Inje University) ;
  • Kim, Jin-Hyang (Institute of Basic Science, Department of Chemistry, Inje University) ;
  • Jang, Han-Na (Institute of Basic Science, Department of Chemistry, Inje University) ;
  • Won, Dong-Seon (Institute of Basic Science, Department of Chemistry, Inje University) ;
  • No, Hyo-Jin (Institute of Basic Science, Department of Chemistry, Inje University) ;
  • Lee, Ju-Yeon (Institute of Basic Science, Department of Chemistry, Inje University) ;
  • Rhee, Bum-Ku (Department of Physics, Sogang University) ;
  • Choi, Hee-Dok (Department of Physics, Sogang University)
  • Published : 2009.03.20
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Abstract

1-{2,4-Di-(2-hydroxyethoxy)phenyl}-2-(2-thienyl)ethene (5) was prepared and condensed with terephthaloyl chloride to yield polyester (6). Polymer 6 was reacted with tetracyanoethylene to give novel Y-type polyester (7) containing 1-(2,4-dioxyethoxy)phenyl-2-{5-(2,2,3-tricyanovinyl)-2-thienyl)}ethenyl groups as NLO-chromophores, which are parts the polymer backbones. Polymer 7 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. It showed thermal stability up to 300 ${^{\circ}C}$ in thermogravimetric analysis with glasstransition temperature obtained from differential scanning calorimetry near 134 ${^{\circ}C}$. The second harmonic generation (SHG) coefficient ($d_33$) of poled polymer film at the 1560 nm fundamental wavelength was around 6.74 x $10^{-9}$ esu. The dipole alignment exhibited high thermal stability up to the glass-transition temperature ($Tg$), and there was no SHG decay below 135 ${^{\circ}C}$ because of the partial main-chain character of polymer structure, which is acceptable for NLO device applications.

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References

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