聚吡咯纤维素纳米晶复合导电材料的制备及其性能表征

摘要：通过硫酸水解法由棉纤维制备纤维素纳米晶，再采用原位化学氧化法，在纤维素纳米晶表面进行吡咯的原位聚合，成功制得包裹聚吡咯的纤维素纳米晶复合导电材料。产物的相貌、结构和性能的研究表明：聚吡咯－纤维素纳米晶复合导电材料表现出核壳结构，纤维素纳米晶与聚吡咯间存在着较强的相互作用有利于聚吡咯均匀地包覆纤维素纳米晶；有机掺杂剂DBSNa由于分子体积大，降低了分子间作用力，其电导率不如无机掺杂剂NaCl，但是热稳定性和比电容好于NaCl，并且显著提高了复合体系的电化学容量，做为超级电容器具有良好的应用前景。

Preparation and characterization of conductive polypyrrole-nanocellulose crystal composite materials

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.