光異構性偶氮苯衍生物之合成及其在液晶顯示元件及光記錄薄膜之應用研究

吳阜蒼

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光異構性偶氮苯衍生物之合成及其在液晶顯示元件及光記錄薄膜之應用研究

Study on the Synthesis of Photoisomerizable Azobenzene Derivatives and Their Applications on LCD and Optically Recording Membranes

吳阜蒼 , Ph.D　　Advisor：劉瑞祥　　

繁體中文

偶氮；液晶； liquid crystal ； azobenzene

Abstract │ Reference (147) │ Times Cited (6) │ Altmetrics

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Polymer dispersed liquid crystal (PDLC) composite films were fabricated by thermal polymerization with E7 liquid crystal, monomers, and novel azobenzene derivatives. All of the compounds synthesized in this study were identified by FTIR, EA and NMR, and the physical properties were analyzed by DSC, TGA and POM. We compared with the electro-optical properties of PDLC films that doped azobenzene monomer and its relative model compound in various alkyl chain lengths (n= 3, 6, 11). We found that the azobenzene monomer shows different behaviors in the electro-optical property from its relative model compound. The addition of azobenzene model compound can improve the ability for light scattering of PDLC sample and it can also stabilize the liquid crystal and decrease the threshold voltage. The addition of azobenzene monomer decreases the ability for light scattering of PDLC sample. The azobenzene model compound showed better electro-optical and thermal-optical properties, having a higher contrast ratio (CR= 689) and a lower saturation voltage (4.7 V/μm). All the azobenzene molecules can be photoisomerized through UV light irradiation, following the mechanism of isomerization. The reversible photo and heat isomerization property was studied. The cis-azobenzene that was transformed from the trans-azobenzene irradiated by UV light can decrease the clearing point of PDLC samples. We used this unique characteristic to record image patterns and it worked successively. We also synthesize various monomers such as ester liquid crystal monomers, bis-acrylloyloxybiphenyl derivatives with various alkyl chain length. We study the effect of these monomers or commercial multifunctional monomers on the electric-optical properties of PDLC films. 
　　We synthesized the homopolymer and copolymers with ester or azobenzene monomers mentioned above. The functional groups were identified by FTIR, NMR and EA. The thermal properties and molecular weight were also analyzed by TGA, DSC and GPC. The polymers that contained azobenzene molecules could proceed reversible light-, and thermal-isomerization process as monomers. It can be used as image record or photo-switchable material. 
　　We also do the research of holography, it is a technology of 3D image record. The effects of the light intensity of incident laser beams, multifunctional monomers, initiator concentrations, feed monomer concentrations, incident writing angles, grating period and film thickness on the diffraction efficiencies were investigated. To investigate the chirality of monomers on the holographic gratings, chiral monomes and the relative racemates(BA and BMA derived form borneol) were synthesized and the dynamic diffraction efficiency was studied. It was found that the steric effects of chiral compounds affect the diffraction efficiency of holograpgic grating of the composite films. The photosensitive holographic polymer films fabricated in this study reveal high diffraction efficiency (95%) and the resolution can up to 1000 lines/mm. The plural data recording can be recorded on the same film successively.

Reference ( 147 ) 〈TOP〉

2.S. T. Wu, D. K. Yang, Reflective Liquid Crystal Dispal (John Wiley and Sons, New York, 2001).
連結：
3.P. J. Colling, M. Hird, Introduction to Liquid Crystals Chemistry and Physics (Taylor and Francis, 1997).
連結：
4.I. C. Khoo, S. T. Wu, Optics and Nonlinear Optics of Liquid Crystal (World Scienific, USA, 1993).
連結：
6.F. Reinitzer, Monatsh. Chem., 9, 421 (1888).
連結：
7.O. Z. Lehmann, Phys. Chem, 4, 4621 (1889).
連結：

Times Cited (6) 〈TOP〉

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