Study On Synthesis And Properties Of Poly Guanidinium Ionic Liquids

In recent years, poly ionic liquids were found to take an enabling role in somefields of polymer chemistry and material science. Poly ionic liquids combine theunique properties(high ion conductivity, chemical stability, non-flammability and nearabsence of vapor pressure) of ionic liquids with the properties of macromolecular andprovide novel properties and functions that are of huge potential in a multitude ofapplications, including solid ionic conductor, dispersant, stabilizer, absorbent andporous polymers, etc. The major advantages of poly ionic liquid are enhanced stability,improved processability, flexibility, improved control over its nano-structure. Polyionic liquids can be prepared either by using a polymerizable cation or anion,resulting in a macromolecular polyelectrolyte possessing repeating charged units. Thestudy of the poly ionic liquids overwhelmingly concentrated in the introduction of thepolymerizable group to the imidazole ionic liquid cations, the common groups areacryloyl or vinyl. There are few reports about guanidine ionic liquid polymerization.Combine the fact of laboratory with literature research, we try to synthesiscompounds which can polymerization directly by the cationic of guanidine salts, andtake a preliminary study of its properties., provide a new program for the study of newmaterials of the functionalized polymer ionic liquids.In this work, we used tetramethylurea,1,3-dimethyl-2-imidazolidinone react withoxalyl chloride to obtain two “vilsmeier salt”, then react with amine bearing methylacryloyl resulted pentaalkylguanidine, and fllowing react with halon, then we gethexaalkylguanidinium. Further occurrence of the anion exchange reaction resultingthe corresponding polymerizable ionic liquids. We prepared twelve guanidine saltspolymerization, and take more traditional thermally induced radical polymerization.Adopt different solvent to precipitate and purified the products according differencesolubility of monmers.Through the above process we prepared the polymers, the molecular weightcharacterized by GPC, the thermodynamic properties measuring through DSC and TGA. The polymers showed good thermodynamic properties according the results, Tgmostly above100℃and the thermal weight loss(10%) temperature mostly above250℃. Polymer which has an anion hexafluorophosphate is more stable than thepolymer which has an anion iodine, and whether the kind of anion, thermal stabilitydecreases with the growth of the side chain.