Synthesis and nonlinear optical properties of novel Y-type polyurethane containing nitrothiazolylazoresorcinoxy groups with highly enhanced thermal stability of second harmonic generation

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• 作者：Kang Yun Choe ; Ji-Hyang Lee ; Jung-Eun Kim and Ju-Yeon Lee
• 关键词：nonlinear optical (NLO) ; polyurethanes ; differential scanning calorimetry (DSC) ; thermogravimetric analysis (TGA) ; atomic force microscopy (AFM) ; second harmonic generation (SHG)
• 刊名：Polymer International
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：65
• 期：4
• 页码：380-386
• 全文大小：703K
• ISSN：1097-0126

文摘

Novel Y-type polyurethane 4 containing 4-(5-nitro-2-thiazolylazo)resorcinoxy groups as nonlinear optical (NLO) chromophores, which are parts of the polymer main chains, was prepared and characterized. Polyurethane 4 is soluble in common organic solvents such as N,N-dimethylformamide and dimethylsulfoxide. It shows thermal stability up to 280 °C as determined from thermogravimetric analysis with a glass transition temperature obtained from differential scanning calorimetry of about 126 °C. The second harmonic generation (SHG) coefficient (d₃₃) of poled polymer film at 1064 nm fundamental wavelength is 3.78 pm V⁻¹. Polymer 4 exhibits thermal stability even at 4 °C higher than glass transition temperature, and no significant SHG decay is observed below 130 °C, which is acceptable for NLO device applications.