Synthesis of Novel Y-type Nonlinear Optical Polyesters with Enhanced Thermal Stability of Dipole Alignment

Bulletin of the Korean chemical society

Ju-Yeon Lee¹  Han-Na Jang¹ 

关键词: Nonlinear optics;    Polyester;    AFM;    Second harmonic generation;    Dipole alignment;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

2,4-Di-(2`-hydroxyethoxy)benzylidenemalononitrile (3) was prepared and polymerized with terephthaloyl chloride and adipoyl chloride to yield novel Y-type polyesters 4 and 5 containing dioxybenzylidenemalononitrile groups as NLO-chromophores, which constituted parts of the polymer backbone. The resulting polymers 4 and 5 are soluble in common organic solvents such as acetone and N,N-dimethylformamide. Polymers 4 and 5 showed thermal stability up to 300 oC in thermogravimetric analysis with glass-transition temperatures obtained from differential scanning calorimetry in the range 83-94 oC. The second harmonic generation (SHG) coefficients (d₃₃) of poled polymer films at the 1064 nm fundamental wavelength were around 6.48 �? 10^?9 esu. The dipole alignment exhibited high thermal stability even at 10 oC higher than T_g and no significant SHG decay was observed below 105 oC partially due to the main-chain character of polymer structure, which is acceptable for NLO device applications.

【 授权许可】

Unknown