| Ionic liquid crystal polymers are a kind of polymers with ions and liquid crystal properties.They combine the excellent properties of polymerized liquid crystals and ionomers and are highly promising materials.They are expected to be applied to functional film materials,optoelectronic devices and solid electrolytes.In this paper,the new class of side chain ionic liquid crystal polymers were designed and synthesized,and side chain ionic liquid crystal polymers based on graphene oxide were constructed by self-assembly technique.Graphene oxide has good thermal,mechanical and electrical properties,and the graphene oxide-modified liquid crystals can improve the mechanical and electrical properties of materials,so that these ionic liquid crystal polymers have a unique microstructure.Eight series of liquid crystal supramolecules were obtained by changing the composition of liquid crystal intermediates and liquid crystal polymers,and its structure and properties were further discussed.The novel supramolecular materials containing graphene oxide were designed and synthesized.Firstly,five monomers were designed and synthesized,cholesteryl isonicotinate(CI),p-diphenyl isonicotinate(BI),iso sorb ide isonicotinate(FI),2-chloro-1,4-diphenyl isonicotinate(PI),2-methyl-1,4-diphenyl isonicotinate(MI);then the monomer CI reacting with BI,FI,PI,MI and graphene oxide respectively to synthesize four series of graphene oxide liquid crystal supramolecular intermediates(B1,B2,B3 and B4);and four series of side-chain ionic liquid crystal polymers(L1,L2,L3 and 14)were prepared by self-assembly reaction between intermediates and poly(styrene sulfonic acid).The synthesized products were characterized and analyzed by fourier transform infrared spectroscopy(FT-IR),hydrogen-nuclear magnetic resonance(1H-NMR),differential scanning calorimetry(DSC),polarized optical microscopy(POM),X-ray diffraction analysis(XRD)and ferroelectric performance tester for their molecular structure,thermal properties and liquid crystal performance and ferroelectric properties.The results showed that the chemical structures of synthesized monomers,graphene oxide liquid crystal supermolecule intermediates and ionic liquid crystal polymers were in line with molecular designed and had good liquid crystallinity.And the liquid crystal polymers shown as nematic phases.With the change of monomers content.the Tm and Ti of the Bi series gradually increased;the Tm and Ti of the B2 series showed a tendency to rise and then decrease;the Tm of the B3 series showed a trend of increasing first and then decreasing,and Ti showed a gradual decline;the Tm and Ti of the B4 series gradually decreased;the Tg of the L1 series gradually increased and Ti showed a tendency to rise and then decrease;both the Tg and Ti of the L2 series had a significant increase;the Tg of the L3 series gradually increased,and Tm and Ti gradually decreased;the Tg of the L4 series gradually increased;and Ti showed a tendency to rise and then decrease.The ferroelectric properties of L1,L3 and L4 series of polymers were gradually weakened with the decrease of CI content,but the ferroelectric properties of L2 series of polymers were gradually strengthened with the increase of F1 content These liquid crystal polymers are promising materials in many applications,such as high-performance electrode materials,ion battery materials and so on.The research content of this paper not only has important theoretical and practical significance,but also provides a certain theoretical basis and necessary technical support for further research on the application of supramolecular ionic liquid crystals and ionic liquid crystal polymers. |
