Synthesis of Functional Ionic Liquids as Solvent for Straw and Application in Modification of Phenolic Resi postprint

Abstract: Three Functional ionic liquids of 1-(2- hydroxyethyl)-3-methyl imidazole chloride ([HeMIM]Cl), 1-ethylamine-3-methyl imidazole bromide ([AeMIM]Br) and 1-carboxy ethyl-3- methyl imidazole chloride ([CeMIM]Cl) were synthesized and characterized by FTIR and HNMR. Then straw was dissolved in the three ionic liquids respectively to produce three solutions of straw, which were further in situ blended with phenol and formaldehyde to prepare phenolic resin composites. The effect of the type of ionic liquids on the dissolution rate of straw and the effect of solutions of straw on the properties of phenolic resin were investigated. The results show that the properties of phenolic resin composites were improved obviously by the three solutions of straw. Among the three ionic liquids, the [CeMIM] Cl is the best solvent for straw to produce the solution, with which the lowest free formaldehyde containing phenolic resin composites may be synthesized; while phenolic resin composite synthesized with the [AeMIM] Cl solution of straw exhibits the best mechanical performance: its tensile strength increased from 3.28 MPa to 9.48 MPa and impact strength increased from 0.93 kJ/m2 to 5.88 kJ/m2 respectively in comparison with those of the ordinary phenolic resin.