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Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers

Ha, Sie Tiong and Ong, Lay Khoon and Yeap, Guan Yeow and Ito, Masato and Saito, Ayumu and Watanabe, Masaaki and Lee, Siew Ling (2010) Effect of terminal branching on mesomorphism of a homologous series of Schiff base ethers. Scientific Research and Essays, 5 (19). pp. 3018-3026. ISSN 1992-2248

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A lot of studies have been focused on the Schiff base's alkyl and alkyloxy possessing polar terminal group. Yet, the thermotropic properties of Schiff base's ether (alkyloxy) with dialkylamino terminal group remained less studied. A series of 4-(dialkylamino)benzylidene-4'-alkyloxyanilines were prepared and all the members are differed by the alkyloxy chain length, CnH2n+1O, where n = 6, 8, 10, 12, 14, 16 and 18. Their transition temperatures and mesophase characteristics were studied by differential scanning calorimetry and optical polarizing microscopy techniques. DSC thermograms exhibited direct isotropization and recrystallization during heating and cooling cycles, respectively. The crystal phase texture changed to dark region isotropic without displaying any mesophase. Lengthening of dialkylamino terminal branch has caused depression of mesomorphic property in the compounds studied.

Item Type:Article
Uncontrolled Keywords:mesophase, Schiff base, terminal branching
Subjects:Q Science > Q Science (General)
ID Code:3391
Deposited By: Narimah Nawil
Deposited On:25 Jun 2012 15:02
Last Modified:29 Nov 2018 15:34

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