Yap, Pui Wing (2025) Synthesis, Characterization, Mesomorphic Properties And Molecular Model Study Of Non-Linear Disulphide Centred Liquid Crystal Oligomers. PhD thesis, Perpustakaan Hamzah Sendut.
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Abstract
Three series of non-linear disulphide centred liquid crystal oligomers, namely azo-ss-n, sb-ss-n and e-sb-ss-n were successfully synthesized and characterized. Azo-ss-n has azo unit (n=n) and no lateral substituent whereas sb-ss-n and e-sb-ss-n have azomethine (hc=n) and respective lateral substituents. The structural elucidation of the compounds was based on the spectroscopic methods such as chn, ft-ir, 1d and 2d-nmr and uv-vis whereas their optical texture and thermal behaviours were analysed by pom and dsc, respectively. All three series are predominantly monotropic nematogen. In the photoisomerization study, azo-ss-n has high ce values (>80.00 %) whereas sb-ss-n and e-sb-ss-n have moderate ce values (>40.00 %). Though, three series showed long duration of thermal back relaxation which suggested their potential in the creation of optical storage devices. Mm2 calculation is conducted to obtain the molecular conformation, molecular length and breadth, aspect ratio and c-s-s-c torsion angle.
| Item Type: | Thesis (PhD) |
|---|---|
| Subjects: | Q Science > QD Chemistry > QD1-999 Chemistry |
| Divisions: | Pusat Pengajian Sains Kimia (School of Chemical Sciences) > Thesis |
| Depositing User: | Mr Hasmizar Mansor |
| Date Deposited: | 07 May 2026 02:26 |
| Last Modified: | 07 May 2026 02:26 |
| URI: | http://eprints.usm.my/id/eprint/64107 |
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