Abstract
Ionic liquid of 1-(2-hydroxylethyl)-3-ethyl imidazolium chloride ([HeEIM]Cl) was synthesized and its chemical structure was examined by FTIR and 1HNMR. Dissolution of the fir powder which was activated with 25% NaOH under different conditions in the ionic liquid was studied. Acrylamide (AM) was grafted onto the dissolved fir powder in [HeEIM]Cl and aqueous medium, respectively. Technologic conditions for graft copolymerization were optimized by orthogonal test. The results showed that the ionic liquid exhibited good solubility for the fir powder, the dissolution rate was as high as 18.3%. The graft copolymer prepared in [HeEIM]Cl had higher grafting degree and grafting efficiency than in aqueous medium. The most suitable conditions for graft copolymerization were: mass fraction of AM 25%, fluid ratio of [HeEIM]Cl to wood 30:1, and mass proportion of wood to AM 1:4. FTIR and SEM suggested that AM had been grafted onto the fir powder. XRD and TG indicated that the crystalline structure of the wood fiber had been destroyed thoroughly after being grafted, and the thermal stability of graft copolymer had been improved.
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