Synthesis of photo-sensitive compounds containing cinnamate moieties for application on photo-alignment

of liquid crystal

1南台化材

Reporter : Chih-Hao Li(李志豪 ) Advisor : Ching-Dong HsiehDate: 100.09.01

Fig. 1. 1H NMR spectra of the DOD-Ci.

Before irradiation

After irradiation

1H NMR

3

UV-Vis

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.

(a) (b)

(c) (d)

南台化材4

ConclusionsConclusions1. 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.

FutureFuture workwork

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.