| After years of development,ionic liquids are no longer just as "green solvents",but are more purposeful in designing ionic liquids with specific functions,such as:magnetic ionic liquids,chiral ionic liquids and so on.At the same time,in order to improve the defects of traditional ionic liquids,new ionic liquids such as zwitterionic ionic liquids and poly(ionic liquid)s have attracted extensive attention from researchers.Ionic gels and poly(ionic liquid)s are two important branches of ionic liquids,which not only retains the excellent performance of ionic liquids,but also has better mechanical strength and is easy to operate.Therefore,it has broad application prospects in the field of electrochemistry.The introduction of ionic liquids into ordered molecular aggregates further extends the use of ionic liquids.Ionic crystal not only have the unique properties of ionic liquids,but also have a highly ordered microstructure of liquid crystals,which attracted widespread attention as an efficient ionic transport channel.In this dissertation,ionic liquids were used as the research object.Though the design of ionic liquids,amphoteric ionic liquids and poly(ionic liquid)s with specific functions were synthesized.This paper is mainly divided into following three parts:Section ?:Briefly introduced the research background and application of ionic liquids,ionic gel and ionic liquid crystal.Section ?:The construction of poly(ionic liquid)s gel electrolyte.A room-temperature amphoteric pyridine ionic liquid with polymerizable groups was designed and synthesized.It was dissolved in water with p-styrene sulfonate,2-acrylamido-2-methylpropane sulfonic acid and acrylic acid at different molar concentrations.A new type of poly(ionic liquid)s gel electrolyte was prepared.The electrolyte exhibited good mechanical properties and excellent electrochemical performance.Under continuous folding and twisting conditions,it still has a higher conductivity value and is basically unchanged.After continuous compression for 10 times,its compressive strength does not change significantly,showing superior self-repairing ability.The reason why the poly(ionic liquid)s gel exhibits excellent mechanical properties mainly comes from the double-network structure formed by strong and weak cross-linking.The electrostatic interaction between the anions and cations is present in the poly(ionic liquid)s chain or between the chains,serving as a sacrificial part to achieve the mechanical strain of the gel.We believe that the prepared poly(ionic liquid)s gel electrolyte is expected to be used in high performance elastic storage and conversion equipment.Section ?:The construction of proton conductive liquid crystal system.A series of imidazole zwitterions(CnIPS,n=12,14,16)with different alkyl chain lengths have been synthesized,A series of proton-containing ionic liquids were synthesized by mixing imidazole zwitterions with fan-shaped 3,4,5-tris(dodecyloxy)benzoic acid(TDBA).The effect of alkyl chain length on the aggregation behavior of ionic liquids was investigated.Among them,C14IPS/TDBA(1:1)exhibits abundant thermotropic liquid crystal behavior,C14IPS itself changes from lamellar phase to cubic phase with increasing temperature,and C14IPS/TDBA(1:1)changes from hexagonal phase to layered phase.The POM,SAXS and DSC systems were used to study the phase behavior of the thermotropic liquid crystal system constructed by this ionic liquid,and based on this,the influence of microstructure on its electrical conductivity was explored.Gaussian simulation data show that the ordered nanostructures formed by the liquid crystal phase provide an ordered channel for proton transport. |
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