研究目的
Investigating the synthesis and electro-optic properties of a novel Y-type polyimide containing nitrothiazolylazodioxyphenyl groups as nonlinear optical (NLO) chromophores.
研究成果
The Y-type polyimide 5 exhibits good solubility in common organic solvents, thermal stability up to 300 °C, and a SHG coefficient (d33) of 2.32 pm/V. The polymer shows no SHG decay below 135 °C, indicating high thermal stability of optical nonlinearity due to the stabilization of dipole alignment of the NLO chromophores.
研究不足
The Tg value of the polymer is relatively low compared to those of common rigid polyimides, which can probably be attributed to the flexibility of the polymer backbone containing ether linkages.
1：Experimental Design and Method Selection:
The synthesis of polyimide 5 involved the reaction of dianhydride monomer 4 with 1,4-phenylenediamine in m-cresol. The polymer was characterized using 1H NMR, IR spectra, and elemental analysis.
2：Sample Selection and Data Sources:
The polymer was purified by extraction in a Soxhlet extractor with methanol and dried under vacuum.
3：List of Experimental Equipment and Materials:
Instruments used include a Varian FT IR-1000 IR spectrophotometer, a Varian VNMRS 500MHz NMR spectrometer, a SECOMAM Model UVIKON XS 99-90289 spectrophotometer, a TA 2920 differential scanning calorimeter, and a TA Q50 thermogravimetric analyzer.
4：Experimental Procedures and Operational Workflow:
The polymer film was corona-poled to induce noncentrosymmetric polar order, and SHG measurements were performed at a fundamental wavelength of 1064 nm using a mode locked Nd-YAG laser.
5：Data Analysis Methods:
SHG coefficients were derived from the analysis of measured Maker-fringes with the Pascal fitting program.
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