Synthesis and Properties of Poly-Urethane-Imide Nonlinear Optical Materials
碩士 === 國立成功大學 === 化學工程學系碩博士班 === 92 === In this study, we use the high b value chromophore (DR19) and the isocyanate (2,4-TDI) as the experiment base. We can successfully synthesis polymers which individually contain liquid crystal, urea, and imide group by high reactive isocyanate. We use the Fou...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2004
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/9cxq67 |
| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 92 === In this study, we use the high b value chromophore (DR19) and the isocyanate (2,4-TDI) as the experiment base. We can successfully synthesis polymers which individually contain liquid crystal, urea, and imide group by high reactive isocyanate. We use the Fourier transform infrared spectroscopy and nucleus magnetic resonance spectrometer for characterizing these monomers and polymers. Then we use thermogravimetric analyzer and differential scanning calorimetry for studying the thermal properties. Finally, We use ultra-violet spectroscopy for measuring poled polymer films’ thermal stabilities.
The results show that polyurethanes containing liquid crystal group have the worse thermal properties and can’t be uniform films by spin coating. When we introduce the urea and imide group in the polyurethane mainchain, we can improve the glassy transition tempetraure efficiently. Their glassy transition tempetraures are about 175~230℃. The polymers have very good solubility. The poled polymer films contain above 80% nonlinear optical property in 110℃ after 20 days.
|
|---|