Preparation And Characterization Of Polycyclophosphazenes Containing Imidazole Ionic Liquid

Poly(ionic liquids)(PILS) have attracted intense attention in various areas, such asmaterials, separation technology, solid electrolyte, nanotechnology and novel catalysts,with the rapid development of ionic liquids (IL). Cyclotriphosphazene derivatives havebeen widely applied in medicine, catalysis, organic synthesis, energy and aerospacematerials, due to their excellent performance such as chain flexibility of linearpolyphosphazenes was well as thermal stability and solvent resistance of crosslinkedpolyphosphazenes. Micro/nano polyphosphazene materials are promising for their highsurface area, strong adsorption ability together with co ntrollability over the structure andproperty. In order to obtain novel poly(ionic liquids) as well as expanding the scope ofionic liquids, we developed a protocol to prepare microsphere poly(ionic liquids) loadedon polyphosphazenes by reaction of hydroxyl group functionalized ionic liquids andhexachlorocyclotriphosphazene to obtain polyphosphazenes substituted with differentproportion of ionic liquid groups followed by polymerization with polyhydroxyliccompounds.Details and scope of this thesis are as follows:(1) Micro/nano materials of poly ionicliquids was synthesized by reaction of1-hydroxyethyl-3-methyl imidazolium chloride[C2OHMIM]+Cl-, HCCP,BPS and triethylamine or pyridine as acid-acceptors in organicsolvent with aid of ultrasound.The above synthesized polyphosphazene materials werefully characterized by SEM, IR, TGA, and XPS.(2) The dependence of ionic liquidspolymer structure and morphology on the solvent polarity, HCCP concentration and theproportion of substrates were also studied and found to be depended on those variables.The results are as follows:The desired functional groups, such as sulfuryl, hydroxyl,etc., were confirmed to be grafted in the materials. Indicated by SEM, the polymerparticles were sphere with controllable diameter range from a few hundred nanometers to few microns.The grafted ionic liquid on the polymer skeleton were reveled by TGAanalysis.The elements composition and binding states were in agreement with theoreticalpredication showed by XPS.The polarity of solvent has positive impacts on the polymerdistribution and lower concentration favors smaller size of the particles and evenlydispersed. When the IL: HCCP mole ratio exceeds1.5, the sizes of polymer particles areirregular with rough surface, and the distributions of particles are uneven.However, theanions showed to have infinitesimal impacts.In summary, we successfully synthesized the micro/nano polyphosphazenescontaining the ionic liquids with potential novel performances. Our work introduced a newfamily of poly ionic liquids that might have potential application in catalysis, biologicalmedicines, nano materials, flame retardant materials, electrochemically and so on.