Preparation And Supramolecular Self-assembly Of Liquid Crystalline Polymers Containing Pyridine Group

Supramolecular liquid crystalline polymer is based on liquid crystal composites, interacting of hydrogen bonding, ionic interaction, charge transfer interaction, hydrophobic interaction, vander Waals force interaction and so can be used for the assembly of supramolecular liquid crystalline polymers. Due to the highly selectivity, derection and saturation of hydrogen bond, Hydrogen bonding of self-assembled supramolecular liquid crystalline has a great deal of flexibility and advantages on performance and it gets the close attention of people. In this thesis, carboxylic acid which attracts much attention is a proton donor. Supramolecular liquid crystalline polymers are preparated by assembling between LCDs which contain pyridine group and dicarboxylic acid.The present paper deals with the synthesis of dicarboxylic acid component monomers:4,4’-(decanedioylbis(oxy)) dibenzoicacid(M1),4,4’-((4,4’-(decanedioylbis(oxy))bis(benzoyl)) bis(oxy)) dibenzoic acid(M2),4’,4’"-(decanedioylbis(oxy))bis(([1,1’-biphenyl]-4-carboxylic acid))(M3). And six series of liquid crystalline ionomers P1-P6containing pyridine group were synthesized. The series of P1were synthesized in the manner of solution condensation polymerization by controlling the proportions of decanedioyl dichloride,4,4’-Biphenyldiol,2,3-Dihydroxypyridine. The series of P2were synthesized in the manner of solution condensation polymerization by controlling the proportions of bis (4-(chlorocarbonyl) phenyl) decanedioate,4,4’-Biphenyldiol,2,3-Dihydroxypyridine. The series of P3were synthesized in the manner of solution condensation polymerization by controlling the proportions of bis(4-(chlorocarbonyl)phenyl)decanedioate,4,4’-Biphenyldiol, Isosorbide. The series of P4were synthesized in the manner of solution condensation polymerization by controlling the proportions of bis(4-(chlorocarbonyl)phenyl) decanedioate, hydroquinone,2,3-Dihydroxypyridine. The series of P5were synthesized in the manner of solution condensation polymerization by controlling the proportions of bis (4-(chlorocarbonyl) phenyl) decanedioate, hydroquinone, Isosorbide,2,3-Dihydroxypyridine. The series of P6were synthesized by controlling the proportions of bis(4’-(chlorocarbonyl)-[1,1’-biphenyl]-4-yl)decanedioate, hydroquinone,2,3-Dihydroxypyridine in the manner of solution condensation polymerization. In addition, the supermolecular polymers, which were prepared by LCPs P1-P6that contain pyridine group with sebacic acid and monomer (M2) by self-assembly separate exhibited liquid crystalline poperties as H1-H6and N1-N6. Especially, the six series of liquid crystalline polymers and the twelve series of supermolecalar polymers were first prepared, they are innovation research.The structures and properties of the obtained monomers were investigated by FT-IR spectroscopy,1H-NMR spectroscopy and differential scanning calorimetry (DSC). The structures and properties of the obtained liquid crystalline polymers and supermolecular polymers were investigated by FT-IR spectroscopy, differential scanning calorimetry (DSC) and polarizing optical microscopy (POM), their structure-property relationships were discussed in detail. Study showed the Tg rised with the increasing of2,3-Dihydroxypyridine in the series of P2, P4, P6.And the Tg decreased with the increasing of Isosorbide in the series of P3, P5. Polymers of P1are not liquid crystal polymers. The series of P2, P4, P6are nematic liquid crystalline polymers, the nematic droplets and schlieren textures belonging to the nematic liquid crystal were obtained. The series of P3, P5are chiral nematic liquid crystalline polymers. Polymers of H1and N1are not liquid crystal polymers.The T1of H2-H6and N2-N6series higntened and the bond of liquid crystalline state of the ten series supermolecular polymers were expanded.