Abstract
A new Y-type polyester (3) containing nitrophenylazocatecholic groups as NLO chromophores, which are parts of the polymer backbone was prepared. Polyester 3 is soluble in common organic solvents such as acetone and dimethylsulfoxide. It shows a thermal stability up to 280°C from thermogravimetric analysis with glass-transition temperature (Tg ) obtained from differential scanning calorimetry near 86°C. The second harmonic generation (SHG) coefficient (d33 ) of poled polymer film at the 1064 nm fundamental wavelength is around 4.42 × 10−9 esu. The dipole alignment exhibits a thermal stability even at 4°C higher than Tg , and no SHG decay was observed below 90°C due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
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