Designing And Synthesis Of A Kind Of Side-chain Ferroelectric Liquid Crystalline Polyacrylate

Based on the liquid crystal polymer theory, a kind of side-chain ferroelectric liquid crystalline polyacrylate was synthesized by choosing biphenyl group as rigid nucleus of mesophase group, L-2-methylbutanol as chiral center and hexylidene as flexible spacing group. The intermediate L-2-methyl butyl 4' -hydroxylbipheyl-4-carboxy -late was synthesized from 4-hydroxylbiphenyl, 4-cyano-4' -hydroxyl biphenyl and L-2-methylbutanol through three different kinds of ways. Consider of the materials, reaction time and yields, the optimal route was chosen. Etherification between hydroxyl and 6-hydroxylhexanecloride is to lead-in flexible spacer, then the monomer was made from the product and acrylic acid. The structure of the intermediate and polymer was identified by FTIR and 1HNMR, their properties of liquid crystalline were characterized by differential scanning calorimeter(DSC), polarized optical microscope(TPOM) and X-ray diffraction(XRD). The main points of this dissertation consist the following points:Firstly, Basic theory and application prospect of ferroelectric liquid crystal and ferroelectric liquid crystal polymer were summarized, according to liquid crystal polymer theory, a kind of side chain ferreo electric acrylate liquid crystals containing optically active substrate were designed and the optimal synthetic route was selected from three different routes.Secondly, Monomers were polymerized by choosing appropriate synthesize route. Influence of different polymeric conditions, such as initiator concentration , monomer concentration , temperature , time, on polymerization of monomers were investigated in detail.Thirdly, the properties of intermediate and polymer were characterized by DSC, TPOM and XRD.Fourthly, the length and slenderness ratio of molecules were analog byusing MM2 pattern program in Chem. 3D when they were in the minimum energy state, so the reasonable explanation for their liquid crystalline properties and ferroelectric properties was given combined with the XRD. Lastly, synthesis of some liquid crystals for display and rearrangement of the STN LCD materials.