Preparation and Nonlinear Optical Properties of Novel Polyesters with Enhanced Thermal Stability of Second Harmonic Generation

Bulletin of the Korean chemical society

Ju-Yeon Lee¹  Dong-Seon Won¹  Jin-Hyang Kim¹ 

关键词: Nonlinear optics;    Polyester;    Thermal stability;    Second harmonic generation;    Relaxation of dipole alignment;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

2,5-Di-(2`-hydroxyethoxy)-4`-nitrostilbene (3) was prepared and polycondensed with terephthaloyl chloride, adipoyl chloride, and sebacoyl chloride to yield novel T-type polyesters (4-6) containing the NLOchromophores dioxynitrostilbenyl groups, which constituted parts of the polymer backbones. Polymers 4-6 are soluble in common organic solvents such as acetone and N,N-dimethylformamide. They showed thermal stability up to 260 oC in thermogravimetric analysis with glass-transition temperatures obtained from differential scanning calorimetry in the range 90-95 oC. The second harmonic generation (SHG) coefficients (d₃₃) of poled polymer films at the 1064 nm fundamental wavelength were around 1.42 �? 10^?9 esu. The dipole alignment exhibited high thermal stability up to 5 oC higher than glass-transition temperature (T_g), and there was no SHG decay below 100 oC due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.

【 授权许可】

Unknown