Mi Young Song, Byeongman Jeon, Hak Jin Kim and Ju-Yeon Lee The design, synthesis, and nonlinear optical properties of novel X-type polyurethane containing dicyanovinylnitroresorcinoxy group with enhanced SHG thermal stability Journal of Polymer Science Part A: Polymer Chemistry 51
New Y-type polyurethane 5 containing 4-(2′,2′-dicyanovinyl)-6-nitroresorcinoxy groups as nonlinear optical (NLO) chromophores was prepared. The resulting polyurethane 5has a thermal stability up to 280 °C with Tg value around 120 °C. The second harmonic generation (SHG) coefficient (d33) of poled polymer film at 1064 nm fundamental wavelength is around 6.12 × 10−9 esu. The polymer exhibits a SHG thermal stability even at 5 °C higher than Tg, and there is no SHG decay below 125 °C. This enhanced thermal stability of optical nonlinearity stems from the stabilization of dipole alignment of the NLO chromophores, which are part of the polymer main chain.
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