Synthesis and Properties of Novel Nonlinear Optical Polyester Containing Nitrophenylazocatecholic Group
摘要:
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 degrees C from thermogravimetric analysis with glass-transition temperature (T-g ) obtained from differential scanning calorimetry near 86 degrees C. The second harmonic generation (SHG) coefficient (d(33) ) of poled polymer film at the 1064nm fundamental wavelength is around 4.42 x 10(-9) esu. The dipole alignment exhibits a thermal stability even at 4 degrees C higher than T-g , and no SHG decay was observed below 90 degrees C due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
Synthesis and Properties of Novel Nonlinear Optical Polyurethane Containing Nitrophenylazocatecholic Group
作者:Mi Young Song、Mi Sung Kim、Byeongman Jeon、Ju-Yeon Lee
DOI:10.1080/15421406.2012.710192
日期:2012.12.3
A novel Y-type polyurethane 3 containing 4-(4-nitrophenylazo)catecholic groups as nonlinear optical (NLO) chromophores was prepared and characterized. Polyurethane 3 is soluble in common organic solvents such as acetone and DMF. Polymer 3 shows a thermal stability up to 270 degrees C from TGA thermogram and the T-g value obtained from DSC thermogram is around 96 degrees C. The second harmonic generation (SHG) coefficient (d(33)) of poled polymer film at 1064 nm fundamental wavelength is 4.58 x 10(-9) esu. The dipole alignment exhibits a thermal stability even at 4 degrees C higher than T-g, and there is no SHG decay below 100 degrees C due to the partial main-chain character of the polymer structure, which is acceptable for nonlinear optical device applications.