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Synthesis of photo-sensitive compounds containing
cinnamate moieties for application on photo-alignment
of liquid crystal
Reporter : Chih-Hao Li(李志豪)
Advisor : Ching-Dong Hsieh
Date: 100.09.01
南台化材
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1H
NMR
Before irradiation
After irradiation
Fig. 1. 1H NMR spectra of the DOD-Ci.
UV-Vis
(a)
(c)
(b)
(d)
Fig. 2. The change of UV absorbance of polymer solution with UV irradiation, (a)PCEMA,
(b)PCEMA/DOD-Ci = 9/1, (b)PCEMA/DOD-Ci = 8/2, (b)PCEMA/DOD-Ci = 7/3. 3
Conclusions
1. 1H NMR showed that DOD-Ci was synthesized sucessfully
and DOD-Ci containing cinnamate groups can produce [2+2]
photoaddition reaction upon their exposure to linearly
polarized ultraviolet (LP-UV) light.
2. As the weight percent of the DOD-Ci increased from 0 to 30%,
the photostability times of the polymer decreased from 30min to
4min.
南台化材
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Future work
1. Observe the changes of UV absorbance of polymer solution
with UV irradiation by UV-vis spectroscopy,
(a)EDCi,(b) PCEMA/EDCi.
2. Observe the changes of UV absorbance of polymer films
with UV irradiation by UV-vis spectroscopy.
3. Observe the POM images of liquid crystal cell.