Study On Synthesis Properties And Applications Of Functionalized Pyridinium Ionic Liquids

Functionalized Ionic Liquid is composed of anion and cation. It will translate into the salt compound with a special function when it lead into one or more functional group ions. This particular molecular structure makes functionalized ionic liquids have a specific function, a wide range of liquid, wide electrochemical window,sort of the unique nature. It exhibits huge potential applications in the novel conductive functional materials, organic synthesis, purification, biological catalysis and many other areas. However, the analysis of molecular structure in ionic liquids and the structure-activity relationship study between structure and properties are lagging behind, there is a big difficulty in design and synthesis of ionic liquids with new function and selective application.In this paper, a variety of functional pyridinium ionic liquids were synthesized from the view point of molecular designing. The pyridine ionic liquids polymers were synthesized by radical polymerization. Ester pyridinium ionic liquids are composed of pyridinium and halogen ester. Carboxyl pyridine ionic liquids are made of pyridinium and chloroacetic acid. The influence factors of synthesizing pyridinium ionic liquids were analyzed, including the reaction temperature, reaction ratio, reaction time.Secondly, The structures of pyridinium ionic liquids were characterized by Infrared spectrum and nuclear magnetic resonance spectroscopy. Then it was characterized by X-ray. Structural analysis showed that the compound [MEPy][PF6] belongs to the monoclinic system,space group P2(1)/n, with unit cell parameters a=14.30(2) nm, b=8.281(14) nm, c= 29.48(5) nm, ?= 95.06 o, Z= 4, V= 3.477(2) nm3, Dc= 1.641 Mg/m3,?=0.308 mm-1, F(000)=1676. The relationship between the structural and conductivity of functional pyridinium ionic liquids were studied by using conductivity instrument. Compared with poly pyridine ionic liquids, the conductivity of ester pyridinium ionic liquids and carboxyl pyridine ionic liquids were larger relatively, and the relation between temperature and conductivity conforms to arrhenius equation.Studying solubility and stability of pyridinium ionic liquids showed that the thermal stability of the ester group-containing pyridine functional ionic liquids is best. Finally,pyridinium ionic liquids were introduced in styrene suspension successfully. It is shown that pull the ester group-containing ionic liquids in the system, the size of polystyrene microspheres distribution is more uniform, the average particle size of microsphereshe is the smallest. Meanwhile, pyridine functionalized ionic liquid has a lower surface energy system, weakening the reunion between the microspheres andother multiple roles in polystyrene microspheres balling process.In summary, we designed and synthesized the ester group-containing pyridine ionic liquids, the carboxyl group-containing pyridine ionic liquids and the polyvinyl pyridine ionic liquid monomers and polymers. Additionally, the porous polymer microspheres were prepared in the styrene polymerization system, that was introduced the ionic liquids monomers into. This provides a new way is brought forward for prepare the porous polymeric materials.