Study On Synthesis And Catalytic Activities Of Comb-like Ionic Liquids Polymer With Benzyl Oxide Group And Imidazole Group

Polymerized ionic liquids(PILs) realize immobilization of the ionic liquids, and possess the unique properties of ionic liquids and macromolecular architecture, whose conductivity, catalytic activity and thermal stability were improved dramatically. As green environmentally-friendly materials, PILs have wide applications for batteries, supercapacitors, catalysis and other fields.In this work, grafted the-OCH2CH2 OH into the vinyl benzene by the method of Williamson firstly. Then the monomer of [VBEGIm]Cl was prepared by chloration and the means of quaternization. Finally, the ionic liquid polymers(P[VBEGIm]Cl) were synthesized by free radical polymerization with [VBEGIm]Cl as raw meterials and azodiisobutyronitrile(AIBN) as initiator. They were characterized by fourier transform infrared(FT-IR), nuclear magnetic resonance(NMR), electron spray ionization mass infrared(ESI-MS) and thermogravimetric(TGA). The results showed that a series of ionic liquid polymers with different polymerization degree were synthesized successfully. The molecular weight of P[VBEGIm]Cl increased firstly and then decreased as the amount of initiator decreased. The decrease of polymerization degree of P[VBEGIm]Cl owed to the cage effect. Besides, the P[VBEGIm]Cl possessed a higher thermal stability than the [VBEGIm]Cl.Basic ionic liquid polymers(BP[VBEGIm]) were prepared by ion exchange, whose surface activity and thermal stability were researched. The results indicated that the BP[VBEGIm] were prepared successfully. The P[VBEGIm]OH possessed a higher thermal stability than the P[VBEGIm]Ac. Moreover, the higher the molecular weight of the polymer, the lower critical micelle concentration, the better surface activity.The basic ionic liquid polymers(BP[VBEGIm]) were used to catalyze the Knoevenagel condensation reaction with benzaldehyde and ethyl cyanoacetate as the substrates. The results indicated that P[VBEGIm]OH had a higher catalytic activity than P[VBEGIm]Ac and the NaOH have the lowest catalytic activity. The catalytic activity had a relationship with the surface activity and basicity. The higher surface activity and stronger alkaline could improve the catalytic activity. Besides, the catalytic activity could also improved by increasing the dosage of the catalyst and using the BP[VBEGIm] who had a higher polymerization degree. The solvent had an effect on the catalytic activity. The catalyst had the best catalytic activity in the dimethyl sulfoxide.