Abstract: Abstract: A cellulose nanocrystalline suspension was obtained from cotton fibers by a modified acid hydrolysis method, and then the conductive composites were prepared through in situ chemical oxidative polymerization of pyrrole monomers on the surface of cellulose nano?bers.The resulting composites were characterizated and indicated the composites possessed a good core-shell structure, and the interaction between polypyrrole and nanocellulose crystal was benefited to the formation of polypyrrole thin layers on the surface of the nanocellulose crystals. It is also been demonstrated that the organic dopant, such as DBSNa with a large molecular weight reduced the intermolecular forces. Compared with those for the inorganic dopant such as NaCl, the composites exhibited a lower electrical, but higher thermal stability and especially larger electrochemical capacitance. These above results showed conductive polypyrrole-nanocellulose crystal composites have a potential application as a electrode materials in the super-capacitor.

Key words: nanocellulose crystal, polypyrrole, conductive composite, dopant, electrochemical property