Synthesis and liquid crystalline properties of new twin diglycidyl ethers based on azomethine groups cured by aromatic diamines

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dc.contributor.authorRajasingam, Ratnamalar
dc.date.accessioned2015-09-03T08:22:50Z
dc.date.available2015-09-03T08:22:50Z
dc.date.issued2010
dc.description.abstractTwo bisphenols containing azomethine groups namely, 3,3'-dimethoxy-4,4'dihydroxy- N-benzylidene-o-tolidine (I) and 4,4' -dihydroxy-N-benzylidene-o-tolidine (II) were synthesized by reaction of o-tolidine with vanillin and phydroxybenzaldehyde. Subsequent reaction with epicholorohydrin in the presence of a catalyst called tetrahexylammonium bromide (THABr) to produce new twin liquid crystalline diglycidyl ethers namely, 3,3 '-dimethoxy-4,4 '-di(2,3-epoxypropoxy)-Nbenzylidene- o-tolidine (III) and 4,4' -di(2,3-epoxypropoxy)-N-benzylidene-o-tolidine (IV). The chemical structures were confirmed by FT-IR, 1H-NMR, 13C-NMR, UVVis spectroscopy and elemental analysis (CHN). Curing of III and IV were then carried out with two different aromatic diamines namely, 4,4'-diaminodiphenyl sulfone (DDS) and p-phenylene diamine (PPDA) in the ratio of diglycidyl ether I diamine 1:1, 2:1, 3:1 and 4:1. The occurrence of curing reaction was confirmed by FT-IR spectroscopy. Degree of crystallinity, liquid crystal behaviors as welJ as the thermal properties of III, IV and the cured new twin diglycidyl ethers were studied by wide-angle X-ray diffractometer (WAXD), differential scanning calorimetry (DSC), polarized optical microscope (POM), and thermogravimetric analysis (TGA), respectively. Mechanical properties of the cured new twin diglycidyl ethers were also studied via adhesion, hardness, flexibility, and impact tests.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/1171
dc.language.isoenen_US
dc.titleSynthesis and liquid crystalline properties of new twin diglycidyl ethers based on azomethine groups cured by aromatic diaminesen_US
dc.typeThesisen_US
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