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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 4
BKCSDE 29(4)
April 20, 2008 

Preparation of Novel T-type Polyurethanes with High Thermal Stability of Second Harmonic Generation and Their Nonlinear Optical Properties
Han-Na Jang, Ga-Young Lee, Ju-Yeon Lee*
Nonlinear optics, Polyurethanes, Thermal stability, Second harmonic generation, Relaxation of dipole alignment
2,5-Di-(2'-hydroxyethoxy)benzylidenemalononitrile (3) was prepared and polymerized with 2,4-toluenediisocyanate and 3,3'-dimethoxy-4,4'-biphenylenediisocyanate to yield novel T-type polyurethanes 4 and 5 containing 2,5-dioxybenzylidenemalononitrile, nonlinear optical (NLO)-chromophores as part of the polymer backbones. Polyurethanes 4 and 5 were soluble in common organic solvents such as acetone and N,Ndimethylformamide and showed a thermal stability up to 250℃ with glass-transition temperatures (Tg) in the range 119-146℃. The second harmonic generation (SHG) coefficients (d33) of poled polymer films at 1064 nm fundamental wavelength were around 5.82 × 10?9 esu. The dipole alignment exhibited high thermal stability up to Tg, and there was no SHG decay below 140℃ due to the partial main-chain character of the polymer structure, which was acceptable for nonlinear optical device applications.
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