Synthesis of liquid crystalline azobenzene containing polymer

Liew, Ka Fun (2007) Synthesis of liquid crystalline azobenzene containing polymer. Universiti Malaysia Sabah. (Unpublished)


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The objective of this thesis is to synthesis of liquid crystalline azobenzene containing polymer. The starting material for the synthesis is 4.Aminoacetophenone. The initial process is diazonium salt coupling reactions which react with sodium nitride and phenol to obtain 4-(4-hydroxyphenylazo)acetophenone. The compound then reacts with 3-bromoprop-1-ene and potassium carbonate to obtain 4-(4- allyloxyphenylazo)acetophenone. This reaction is called Williamson synthesis reaction. The synthesized compound then undergoes radical polymerization reaction and purification. These reactions are reacted by AIBN as initiator and dried THF as the solvent The final compound was 4-(4 propoxyphenylazo)acetophenone. This final compound is purified by methanol and crystallization. The final compound has a mching point at the range of 92°C to 105°C. By compare the functional group in the FT-lR spectra 4-( 4-hydroxyphenylazo )acetophenone, 4-(4allyloxyphenylazo)acetophenone, and 4-(4-propoxypbenylazo)acetophenone, these compounds are indicated that the functional groups are in molecular structure as projected. The DSC analysis showed the compound has 110.69°C endothennic peak and 80.74 J/g enthalpy changes. The compound also has exothermic peak at 106.05ºC and 81.76 J/g enthalpy changes.

Item Type: Academic Exercise
Uncontrolled Keywords: crystalline azobenzene, synthesis of liquid, polymer, 4-Aminoacetophenone, diazonium salt, temperature, Williamson synthesis reaction
Subjects: Q Science > QD Chemistry
Divisions: SCHOOL > School of Science and Technology
Date Deposited: 08 Jan 2014 06:45
Last Modified: 10 Oct 2017 08:25

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