標題: | Mesomorphic behaviors of a series of heterocyclic benzothiazole-imine-ester-based liquid crystals |
作者: | Foo, K. -L. Ha, S. -T. Yeap, G. -Y. Lin, H. -C. 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | Benzothiazole;nematic;smectic A;enantiotropic |
公開日期: | 1-一月-2019 |
摘要: | A series of new calamitic liquid crystals, 2-[4-(4-alkoxybenzoyloxy) benzylidenamino]benzothiazoles comprising a heterocyclic (benzothiazole) and two phenyl rings core system, terminal alkoxy chain, imine and ester linkers were prepared and characterized. This series comprises eight members wherein the members vary by the length of alkoxy chain (CnH2n+1O-, where n = 4, 6, 8, 10, 12, 14, 16, 18). Spectral analysis results were in conformity with the expected structure. Their thermotropic behaviors were studied by using differential scanning calorimetry, optical polarizing microscopy and powder X-ray diffraction techniques. A single mesophase (nematic) was observed for the first member of the series (n = 4). As the alkoxy chain increased to n = 6, 8, 10, 12, 14, the nematic phase appeared together with an additional SmA phase. When moving from n = 16 until the highest member (n = 18), the nematic phase disappeared and these compounds only exhibited a single mesophase (SmA). |
URI: | http://dx.doi.org/10.1080/01411594.2018.1552272 http://hdl.handle.net/11536/148798 |
ISSN: | 0141-1594 |
DOI: | 10.1080/01411594.2018.1552272 |
期刊: | PHASE TRANSITIONS |
Volume: | 92 |
起始頁: | 87 |
結束頁: | 99 |
顯示於類別: | 期刊論文 |