Synthesis And Properties Of Chiral Liquid Crystal Polymers Containining Donor-Acceptor Electrons And Monomers

Supramolecular liquid crystal Chemistry studies recombination of LC System, which was found by molecules subunit through covalent such as hydrogen bonding subunit,ion interaction, charge-transfer interactions, Van der Waals force and hydrophobic interaction. Electron donor-acceptor (EDA) interaction is between the multi-electronic donor and wanting-electronic acceptor, as a result of charge-transfer and overlap arising from the interaction. When the introduction of charity, the Liquid Crystalline Polymers(LCPs) combine unique optical properties of cholesteric liquid crystals with physical properties of liquid crystalline polymers (LCPs), which have been one of important research projects in the field of LCPs. Because of the excellent properties, cholesteric liquid crystalline polymers have potential applications in numerous areas, especially in the field of electronic material, display material, nonlinear optics and specialty organic coating etc, and will play a more and more important role in the sophisticated technique field.In this thesis, six monomers M1～M6 were synthesized, which include two kinds of cholesteric phase monomer cholesteryl 4-{5-{[4-(4-allyloxy) phenyl] phenyloxycarbonyl} hexanoyloxy}benzoic acid(M2), Cholesteryl 4-allyloxy phenylpropionic acid (M4); three kinds of nematic phase monomer:4-{5-[4-(4-allyloxy) phenyl] phenyloxycarbonyl}hexanoyloxy biphenyl cyanogen(M3),4-(10-undecylen-1-yloxycarbonyl)-biphenyl cyanogen (M5),4-(10-undecylen-1-yloxycarbonyl)benzoic acid biphenyl cyanogen(M6); 2-(4-allyloxy benzoate)-5-{[4-(4-propoxy)phenyl]phenyloxycarbonyl}pentanoic acid isosorbide (M1) as chiral agent had no liquid crystalline properties. P1 were prepared by graft polymerization of M1 and M5 using polymethylhydrosiloxane as backbone and P2 were prepared by graft polymerization of Mi and M5 using polymethylhydrosiloxane as backbone.The structures and optical and thermodynamic properties of the obtained liquid crystalline monomers and polymers were investigated by rotation activity instrument, FT-IR spec-troscopy, differential scanning calorimetry (DSC) and polarizing optical microscopy (POM).Results of experiments and analyses indicated that Polymers P1 series were cholesteric liquid crystals; Polymers P2 series were chiral smectic C (SC*) phase liquid crystals. The ranges of temperature of liquid crystalline phase of P1 series were narrow, but that of P2 series were wide.The glass transition temperature of P1 and P2 increased with the increased of chirility reagent (M1), While clearing point decreased at the same time, P1 series exibited cholesteric liquid crystal phase, P2 showed chiral smectic C (SC*) phase with the increase of the chiral monomer M1. Compared with the monomers, P1 and P2 series have excellent thermal stability and therefore have a certain applied value.