Molecular design, synthesis, and electro-optic properties of novel Y-type polyesters with high thermal stability of second harmonic generation

• Published in: Polymer international Vol. 55; no. 2; pp. 248 - 256
• Main Authors: Lee, Ju-Yeon, Jung, Won-Taek, Lee, Won-Jung
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.02.2006; Wiley
• Subjects: Applied sciences; atomic force microscopy (AFM); differential scanning calorimetry (DSC); Exact sciences and technology; NLO; Organic polymers; Physicochemistry of polymers; polyester; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; relaxation of dipole alignment; SHG coefficient; thermogravimetric analysis (TGA); Nitro compound; Second harmonic generation; differential scanning calorimetry (DSC); atomic force microscopy (AFM); Ester polymer; Non linear optics; Electrooptical properties; Condensation polymerization; thermogravimetric analysis (TGA); Electrooptical coefficient; Experimental study; Functional polymer; Lateral group; Thermal stability; Stilbene derivatives; relaxation of dipole alignment; Thermal properties; NLO; polyester; Optical properties; Preparation; Soluble compound; Optical material; SHG coefficient
• ISSN: 0959-8103; 1097-0126
• DOI: 10.1002/pi.1965

3,4‐Di‐(2′‐hydroxyethoxy)‐4′‐nitrostilbene was prepared and condensed with terephthaloyl chloride, adipoyl chloride, and sebacoyl chloride to yield novel Y‐type polyesters containing NLO‐chromophore dioxynitrostilbenyl groups, which constituted parts of the polymer backbone. Polymers were found soluble in common organic solvents such as acetone and N,N‐dimethylformamide. They showed thermal stability up to 300 °C in thermogravimetric analysis with glass‐transition temperatures obtained from differential scanning calorimetry in the range 110–152 °C. The second harmonic generation (SHG) coefficients (d33) of poled polymer films at a 1064 cm−1 fundamental wavelength were around 3.51 × 10−8 esu. The dipole alignment exhibited high thermal stability even at 10 °C higher than the glass‐transition temperature, and there was no SHG decay below 120 °C for one of these polymers due to the partial main‐chain character of polymer structure, which was acceptable for NLO device applications. Copyright © 2005 Society of Chemical Industry