Novel superabsorbent hydrogels were prepared successfully from carboxymethylcellulose
sodium (CMC) and cellulose in the NaOH/urea aqueous system by using epichlorohydrin
(ECH) as cross-linker. The structure and morphology of the hydrogels were characterized
by FT-IR spectroscope, thermogravimetric analysis and scanning electron microscope.
The results revealed that the CMC contributed to the enhanced size of pore, whereas cellulose
as a strong backbone in the hydrogel to support it for keeping its appearance. Their
equilibrium swelling ratio in distilled water and different physiological fluids were evaluated,
indicating the maximum swelling ratio in water reached an exciting level of 1000 as
the hydrogels still keeping a steady appearance. Moreover, the hydrogels exhibited smart
swelling and shrinking in NaCl or CaCl2 aqueous solution, as well as the release behavior of
bovine serum albumin (BSA) that could be controlled by changing CMC content. The cellulose-
based hydrogels are promising for the applications in the biomaterials area.