Synthesis and nonlinear optical properties of novel Y-type polyester containing tricyanovinylthiazolylazoresorcinoxy group with enhanced thermal stability of dipole alignment

• Published in: Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2011-04, Vol.49 (8), p.1784-1790
• Main Authors: Cho, You Jin, No, Hyo Jin, Kim, Mi Sung, Lee, Ju-Yeon
• Format: Article
• Language: English
• Subjects: Alignment; Applied sciences; atomic force microscopy; differential scanning calorimetry; dipole alignment; Dipoles; Exact sciences and technology; Glass transition temperature; NLO; Nonlinearity; Optical properties; Organic polymers; Physicochemistry of polymers; polyester; Polyester resins; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; second harmonic generation; Thermal stability; thermogravimetric analysis
• ISSN: 0887-624X; 1099-0518; 1099-0518
• DOI: 10.1002/pola.24603

Novel Y‐type polyester 4 containing 5‐methyl‐4‐{5‐(1,2,2‐tricyanovinyl)‐2‐thiazolylazo}resorcinoxy groups as nonlinear optical (NLO) chromophores, which are parts of the polymer backbone, was prepared, and its NLO properties were investigated. Polyester 4 is soluble in common organic solvents such as N,N‐dimethylformamide and dimethylsulfoxide. Polymer 4 shows a thermal stability up to 250 °C from thermogravimetric analysis with glass‐transition temperature obtained from differential scanning calorimetry of approximately 94 °C. The second harmonic generation (SHG) coefficient (d33) of poled polymer film at 1560‐nm fundamental wavelength is 8.12 × 10−9 esu. The dipole alignment exhibits a thermal stability even at 6 °C higher than glass‐transition temperature (Tg), and no significant SHG decay is observed below 100 °C due to the partial main‐chain character of polymer structure, which is acceptable for NLO device applications. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 A novel Y‐type polyester 4 containing 5‐methyl‐4‐{5‐(1,2,2‐tricyanovinyl)‐2‐thiazolylazo}resorcinoxy groups as NLO chromophores was prepared. The resulting polyester 4 has a thermal stability up to 250 °C with Tg value around 94 °C. The SHG coefficient (d33) of poled polymer film at 1560‐nm fundamental wavelength is near 8.12 × 10−9 esu. The polymer exhibits a SHG thermal stability even at 6 °C higher than Tg, and there is no SHG decay below 100 °C. This enhanced thermal stability of optical nonlinearity stems from the stabilization of dipole alignment of the NLO chromophores, which are parts of the polymer main chain.