Synthesis of Fluorinated Liquid Crystals
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Kent State University / OhioLINK
2008
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ndltd-OhioLink-oai-etd.ohiolink.edu-kent12281563592021-08-03T05:36:49Z Synthesis of Fluorinated Liquid Crystals Khairuddean, Melati Chemistry semifluorinated and fluorinated liquid crystals Research here involves the design and synthesis of liquid crystals with concentration on the influence of fluorination on the physical properties in a variety of structures and phases. Fluorine substitution in different positions within the core, the terminal chains or the linking groups produce materials with different physical properties. A variety of liquid crystals with semifluorinated tails including 4-alkoxybenzoic acids, 4-alkoxybenzoyl hydrazines and N,N’-bis(4-alkoxybenzoyl) hydrazines have been synthesized and their properties are compared with their perhydrogenated analogs. We also report the synthesis and mesogenic properties of a new series of 2,5-diaryl-1,3,4-oxadiazoles and 2,5-diaryl-1,3,4-thiadiazoles with semifluorinated alkoxy chains and compare them with their perhydrogenated analogs. To better understand the influence of the different components of the amphiphilic polyhydroxy molecules on their mesophase behavior, we synthesized and characterized a series of some new hydroxylated amides derived from 3,4,5-tris(n-nonyloxy)benzoic acid and some ester versions of these molecules (as opposed to the known amide mesogens). Different mesophases have been observed depending on the identity of the hydrophilic units. We also synthesized and initiated studies of substitution at different positions in 2,5-functionalized-1,3,4-oxadiazole compounds to understand how the 1,3,4-oxadiazole unit influences the mesogenic properties. We have synthesized some biphenyl twin mesogens with different spacers and fluorine content in order to further investigate whether flexoelectricity is somehow related to the stability of these blue phase liquid crystals. 2008-12-01 English text Kent State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=kent1228156359 http://rave.ohiolink.edu/etdc/view?acc_num=kent1228156359 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Chemistry semifluorinated and fluorinated liquid crystals |
| spellingShingle |
Chemistry semifluorinated and fluorinated liquid crystals Khairuddean, Melati Synthesis of Fluorinated Liquid Crystals |
| author |
Khairuddean, Melati |
| author_facet |
Khairuddean, Melati |
| author_sort |
Khairuddean, Melati |
| title |
Synthesis of Fluorinated Liquid Crystals |
| title_short |
Synthesis of Fluorinated Liquid Crystals |
| title_full |
Synthesis of Fluorinated Liquid Crystals |
| title_fullStr |
Synthesis of Fluorinated Liquid Crystals |
| title_full_unstemmed |
Synthesis of Fluorinated Liquid Crystals |
| title_sort |
synthesis of fluorinated liquid crystals |
| publisher |
Kent State University / OhioLINK |
| publishDate |
2008 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=kent1228156359 |
| work_keys_str_mv |
AT khairuddeanmelati synthesisoffluorinatedliquidcrystals |
| _version_ |
1719422486343319552 |