Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Synthesis and Nonlinear Optical Properties of Novel Y-Type Polyesters with Enhanced Thermal Stability of Second Harmonic Generation

  • Kim, Jin-Hyang (Institute of Functional Materials, Department of Chemistry, Inje University) ;
  • Lee, Ju-Yeon (Institute of Functional Materials, Department of Chemistry, Inje University) ;
  • Won, Dong-Seon (Institute of Functional Materials, Department of Chemistry, Inje University) ;
  • Rhee, Bum-Ku (Department of Physics, Sogang University)
  • Published : 2007.10.31
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Abstract

2,3-Di-(2'-hydroxyethoxy)-4'-nitrostilbene (3) was prepared and condensed with terephthaloyl chloride, adipoyl chloride, and sebacoyl chloride to yield novel Y-type polyesters (4-6) containing the NLO-chromophores 2,3-dioxynitrostilbenyl groups, which constituted parts of the polymer backbones. Polymers 4-6 were soluble in common organic solvents such as acetone and N,N-dimethylformamide. Polymers 4-5 showed thermal stability up to $300^{\circ}C$ in thermogravimetric analysis with glass transition temperatures $(T_g)$, obtained from differential scanning calorimetry, in the range $81-95^{\circ}C$. The second harmonic generation (SHG) coefficients $(d_{33})$ of the poled polymer films at the 1064 nm fundamental wavelength were around $3.68{\times}10^{-9}$ esu. The dipole alignment exhibited high thermal stability up to $T_g$, and there was no SHG decay below $T_g$ due to the partial main-chain character of the polymer structure.

Keywords

References

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