Cellulose Fiber And Hollow Fiber Membranes Spinning Use Ionic Liquids As Solvent

Room temperature ionic liquids (RTILs), namely molten salts, are a class of novel environment-friendly "green solvents". In recent years, it is improved stability to the air and moisture has provided renewed vigor to its application. Based on its strong polarity, non-toxicity and easy recovery, the present work is exploiting the possibility for ionic liquids to act as a good solvent for cellulose.Six RTILs were synthesized and means of testing techniques were used to analyse and characterize the composition and structure. Dissolution process of cellulose in these RTILs were investigated by microscope. The rheometer has been used to study the rheological behaviors of Cellulose/RTILs solutions, and use this solution for wet spinning and spinning hollow fiber membranes. Relevant testing techniques were done.FTIR, ~1HNMR and element analyze techniques were used to monitor the composition and structure of synthesized ionic liquids. The results indicated consistence with expect products. The study on their characters showed high electricity conduct rate. And an increase with temperature was found under a same concentration, and also an increase with concentration under a same temperature.Among ionic liquids that synthesized, two ( [BMIM] Cl and [AMIM] Cl) were found to be direct solvent of cellulose and with a strong ability. 3wt % Cellulose/[BMIM]C1 solution with small viscosity, not suit to wet spinning. While the 5wt% one was pseudoplastic fluid, namely shearing force fluid. Both its apparent viscosity and viscous flow activation energy were decrease with the increase of shearing rate. Cellulose fibers and hollow fiber membranes span, which used ionic liquid as solvent, breaking tenacity was 2.56cN/dtex. The water flux of hollow fiber membranes enhance with increase coagulation bath temperature.