Synthesis of bent shaped ,liquid crystal having polymerizable monomers

Tan, Chuan Hong (2007) Synthesis of bent shaped ,liquid crystal having polymerizable monomers. Universiti Malaysia Sabah. (Unpublished)


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The objective of this study is to synthesize a bent shaped liquid crystal that exhibit meso genic properties. It focuses only on the organic synthesis of bent shaped liquid crystal and the determination of mesogenic behaviour of polymer liquid crystal. The starting material for the synthesis is ethyl-4-aminobenzoate. The initial step of the synthesis involves diazonium coupling reaction with phenol to obtain ethyl-4-(4- hydroxyphenylazo) benzoate. The compound undergoes Williamson ether synthesis to obtain [4-( 4-ethyl-diazobenzoate )phenyloxy ]prop-l-ene. Then, the compound was hydrolyzed by potassium hydroxide to produce 4-(4-allyloxyphenylazo) benzoic acid. Finally, the benzoic acid was reacted with Dee and DMAP in dry dichloromethane to yield 1,3-phenylene bis [4-(4-allyloxyphenylazo)benzoate. From the FT-IR spectrum, it indicates that the compound synthesized has all the functional group in the molecular structure. It indicates functional groups that present such as alkyl group, benzene rings, carbonyl group of an ester, ester and ether. NMR analysis determined molecular structure of the final compound where types of protons attached to the carbons can be clearly identified through downfield readings. Differential Scanning Calorimetry (DSC) used to determined crystallization temperature of the final product.

Item Type: Academic Exercise
Uncontrolled Keywords: Bent Shaped Liquid Crystal, Crystal Having Polymerizable Monomers
Subjects: Q Science > QD Chemistry
Date Deposited: 29 Jul 2013 06:38
Last Modified: 23 Oct 2017 07:16

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