In our laboratory, NaOH/urea aqueous solutions have been developed to dissolve cellulose. In NaOH/urea aqueous solution, NaOH “hydrates” can be more easily attracted to cellulose chains through the formation of new hydrogen-bonded networks at low temperatures, while the urea hydrates can possibly be self-assembled at the surface of the NaOH hydrogen-bonded cellulose to form an inclusion complex (IC), leading to the good dissolution(Cai et al., 2008). Moreover, it has been confirmed that a worm-like
cellulose IC being surrounded with urea hydrates exists in the cellulose solution. The cellulose solution is relatively unstable and can be very sensitive to temperature, polymer concentration and storage time, leading to the aggregations (Cai et al., 2008). At either higher temperature (above 30 ◦C), or lower temperature