標題: | Mesogenic Schiff's base ether with dimethylamino end group |
作者: | Ha, Sie-Tiong Ong, Lay-Khoon Wong, Joanna Pik-Wan Yeap, Guan-Yeow Lin, Hong-Cheu Ong, Siew-Teng Koh, Teck-Ming 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | Schiff base;p-n-(dimethylamino)benzylidene-p-alkyloxyanilines;nematic;structure-property relationships |
公開日期: | 2009 |
摘要: | A series of Schiff base ethers comprising a dimethylamino group at one terminal position and an even number of carbons at the other along the molecular axis was studied. The dimethylamino unit, acting as a charge-transfer donor in the formation of conjugative interactions, contributes to the molecule's polarizability and in turn affecting its intermolecular interactions, leading to the formation of less-ordered mesophase. The mesomorphic properties were studied using polarizing optical microscopy and differential scanning calorimetry. Whilst the n-butyloxy to n-hexadecyloxy derivatives exhibited nematic phase, the n-ethyloxy, n-propyloxy and n-octadecyloxy derivatives were not mesogenic. Their phase transitions during heating and cooling run were presented. The title compounds were compared with other structurally related series to establish their chemical structure-mesomorphic property relationships. |
URI: | http://hdl.handle.net/11536/7941 http://dx.doi.org/10.1080/01411590902957449 |
ISSN: | 0141-1594 |
DOI: | 10.1080/01411590902957449 |
期刊: | PHASE TRANSITIONS |
Volume: | 82 |
Issue: | 5 |
起始頁: | 387 |
結束頁: | 397 |
顯示於類別: | 期刊論文 |