In this study, we extend the rigidity and resonance of benzobisthiazo-
le 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 (PHI) was first prepared using direct thermal imidization of 2,4-diaminophenol dihydrochloride 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 PHI and the chromophore. This ether linkage is expected to provide chain flexibility for better orientation under electric field during poling. Formation of benzobisthiazole-based chromophore and the corresponding NLO-PI was evidenced by FTIR and UV-vis spectra. TGA and TMA reveal a thermal decomposition temperature and a glass transition temperature as high as 576 and 324oC, respectively. The electrooptic coefficient of the NLO-PI at a wavelength of 630nm was found to be r33 = 6.62 pm/V.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-1123104-152633 |
| Date | 23 November 2004 |
| Creators | Chiu, Tzu-wei |
| Contributors | Bing-Hwait Hwang, Tzu-Chien Hsu, none |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1123104-152633 |
| Rights | not_available, Copyright information available at source archive |
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