Synthesis and Nonlinear Optical Properties of Novel Polyester Containing Tricyanovinylthiophene with Enhanced Thermal Stability of Second Harmonic Generation

• Published in: Molecular Crystals and Liquid Crystals Vol. 504; no. 1; pp. 196 - 203
• Main Authors: Lee, Ga-Young, No, Hyo Jin, Lee, Ju-Yeon
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis Group 01.01.2009; Taylor & Francis Ltd
• Subjects: differential scanning calorimetry (DSC); NLO; Optical properties; polyester; Polyesters; Polymer films; relaxation of dipole alignment; SHG coefficient; Solvents; thermogravimetric analysis (TGA)
• ISSN: 1542-1406; 1563-5287; 1527-1943
• DOI: 10.1080/15421400902950170

A novel Y-type polyester (7) containing 1-(2,4-dioxyethoxy)phenyl-2-{5-(1,2,2-tricyanovinyl)-2-thiophenyl)}ethenyl groups as NLO-chromophores was synthesized and characterized. Polymer 7 was soluble in common organic solvents such as DMF and DMSO. It showed thermal stability up to 300°C in TGA with T g value obtained from DSC near 134°C. The second harmonic generation (SHG) coefficient (d 33 ) of poled polymer film at the 1,560 nm fundamental wavelength was around 6.74 × 10 −9 esu. The dipole alignment exhibited high thermal stability and there was no SHG decay below T g due to the partial main-chain character of polymer structure, which was acceptable for NLO device applications.