Synthesis and Characterization of Novel Nonlinear Optical Polyimides Containing Benzobisthiazole-Derived Chromophore

• Main Authors: Hsuan-Ping Chen, 陳烜平
• Other Authors: 許子建
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/x9dg3s

碩士 === 國立中山大學 === 材料科學研究所 === 95 === In this study, we extend the rigidity and resonance of benzobisthiazole for the application as second-order nonlinear optics. A novel nonlinear optical polyimide (NLO-PI) containing side-chained benzobisthiazole- based chromophore has been synthesized. A hydroxyl- containing PI (W2) was prepared using direct thermal imidization of 4,4''-diamino-4"- hydroxytriphenylmethane(DHTM) and 4,4’-(hexafluoroisopropylidene) diphthalic anhydride; the benzobisthiazole-based chromophore was then prepared using 2,5-diamino-1,4- benzenedithiol dihydrochloride as the starting monomer. The final NLO-PI was obtained by the Mitsunobu reaction via ether linkage between W2 and the chromophores. This ether linkage is expected to provide chain flexibility for better orientation under electric field during poling. The C=C bonds inside the chromophores also provide more orientation probabilities and conjugation length. Formation of benzobisthiazole-based chromophore and the corresponding NLO-PI was evidenced by FTIR and UV-vis spectra. TGA reveal a thermal decomposition temperature as high as 350oC, respectively. The electrooptic coefficient of the NLO-PI at a wavelength of 830nm was found to be r33=9.75 pm/V.