Synthesis And Characterization Of Chiral Liquid Crystals Containing Carboxyl Groups And Its Liquid Crystalline Polymers

Liquid crystalline polymers (LCPs) with high strength and stiffness, high chemical resistance, good dimensional stability and low linear thermal expansion coefficient are attractive high performance engineering materials. Liquid crystalline ionomers (LCIs) are liquid crystalline polymers containing ionic groups and the properties of LCIs are superior to the LCPs because of the compatibilization in composites by the function of ionic groups between the molecule chains. Therefore, LCIs are one new kind of function polymer materials and have been one of important research project in the field of LCPs. chiral side-chain liquid crystalline polymers (LCPs) have attracted considerable attention and interest, mainly because of their unique properties, including the selective reflection of light, optical rotation, circular dichroism and ferroelectricity, and their potential applications in numerous areas, especially in the fields of optics, thermal conducting materials and so on.In this thesis, five monomers M1～M5and three series of LCIs Pi-P3are synthesized, which include10-(6-(6-(4’-(4-()benzoyloxy)biphenyl-4-yloxy)-6-oxohexanoyloxy)hexahydrof uro[3,2-b]furan-3-yloxy)-10-oxodecanoic acid (M1),8-(6-(6-(4’-(4-(allyloxy) benzoyloxy) biphenyl-4-yloxy)-6-oxohexanoyloxy)hexahydrofuro[3,2-b]furan-3-yloxy)-8-oxooctanoic aci d (M2),6-(6-(6-(4’-(4-(allyloxy)benzoyloxy)biphenyl-4-yloxy)-6-oxohexanoyloxy) hexahydr ofuro[3,2-b]furan-3-yloxy)-6-oxohexanoic acid (M3),4-((6-(6-(4’-(4-(allyloxy)benzoyloxy)bi phenyl-4-yloxy)-6-oxohexanoyloxy)hexahydrofuro[3,2-b]furan-3-yloxy)carbonyl)benzoic aci d (M4),4-methoxyphenyl4-(allyloxy)benzoate (M5). Moreover, the obtained monomers and all the polymers, except M5, are novel.IR spectroscopy, rotation tester, differential scanning calorimetry (DSC)and polarizing optical microscopy (POM) were used to study the structure, LCIs and monomers. The results show that four monomers M1～M4are cholesteric liquid crystalline, Three series of polymers have good Liquid crystalline. As the mol%of chiral ionic liquid crystal monomer content increases, all the Tg increase, however all the Ti increased first and then decreased. The chiral monomers and three series of polymers have good optical properties.