The synthesis and characterization of liquid crystalline polymer with alkyl chains

Ling, Tai Shyan (2010) The synthesis and characterization of liquid crystalline polymer with alkyl chains. Universiti Malaysia Sabah. (Unpublished)


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A rod-shaped monomer containing azobenzene based mesogen moieties with allyl as terminal group was synthesized. Ethyl 4-(4-allytoxylphenylazo)benzoate was synthesized from Ethyl 4-(4-hydroxyphenyl(azo)benzoate) using Williamson ether synthesis by allyl bromide. It is polymerized using AlBIN as Initiator, leads to formation of a final compound, which was Poly[Ethyl 4-(4-allytoxylphenylazo)benzoate]. Fourier-Transform-IR (FT-IR) was used to Identify the molecular structure of the compounds. FT-IR spectrums show the presence of aliphatic alkyl chains, azobenzene moieties, and carboxyl group In the final compound. UV spectromebic analysis shows the presence of azo linkage In PoIy[Ethyl 4-(4-allytoxylphenylazo)benzoate]. The phase transition temperatures and enthalpies were evaluated by thermal analysis of differential scanning calorimetry (DSC). From the thermogram, it shows endothermic peak at 124.44 °C and exothermic peak at 115.76°C.

Item Type: Academic Exercise
Uncontrolled Keywords: azobenzene, allyl bromide, AIBIN, Fourier-Transform-IR (FT-IR), differential scanning calorimetry (DSC), rod-shaped
Subjects: T Technology > TP Chemical technology
Divisions: SCHOOL > School of Science and Technology
Depositing User: Unnamed user with email
Date Deposited: 04 Sep 2015 08:42
Last Modified: 27 Oct 2017 02:23

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