Mesomorphic phase transitions of 4,4'-dialkyloxyquaterphenyls and dialkyl quaterphenyl-4,4'-dicarboxylates |
| |
| Authors: | Masahiko Sahara Shinichi Yano Kenichi Ikemoto Kazuo Maejima |
| |
| Affiliation: | a Department of Chemistry, Faculty of Engineering, Gifu University, Gifu, Japanb Sanko Kaihatsu Kagaku Kenkyusyo Co., Ltd., Shiga, Japanc Chemical Research Institute, Sekisui Chemical Co., Ltd., Osaka, Japan |
| |
| Abstract: | The mesogenicities of 4,4'-dialkyloxyquaterphenyls (DAQP) and dialkyl quaterphenyl-4,4'-dicarboxylates (DCQP) were studied by differential scanning calorimetry, optical microscopy and miscibility tests. The DAQP homologues, for which the number of carbon atoms in the alkyloxy group (n) is 1-9, showed a SA phase, and the higher homologues (n = 9-18) showed a Sc phase. The propyl, butyl and pentyl esters of DCQP showed a SA phase, and the octyl and dodecyl esters showed SA and Sc phases. The isopropyl, isobutyl, 2-ethylhexyl and cyclohexyl esters showed a Sc phase and the branching of the alkyl group strikingly lowered the mesophase thermal stabilities. |
| |
| Keywords: | |
| 本文献已被 InformaWorld 等数据库收录！ |
|
