Conductive Polymer / Bacterial Cellulose Nanocomposites Preparation And Properties Of

The nanostructured conducting polymers, such as polyaniline (PANI) and polypyrrole (PPy), have found wide applications including electrode material, sensors and supercapacitors, due to a combination of the advantages for both organic semiconductors and nanomaterials. Thus, it is important to prepare nanostructured multi-functional conducting polymers with controllable morphology for practical applications. This thesis concentrates on the preparation of nanostructured conducting polymer composites via in-situ polymerization of anailine or pyrrole onto bacteria cellulose (BC) scaffold. By optimization of reaction conditions, conducting polymer composites with controlled morphology have been achived, with their application in supercapacitors explored. This research has renderd important results as follows:For PANI/BC nanocomposites, the optimized reaction conditions have been achieved as follow:mass ratio of BC to aniline is 0.1, molar ratio of oxidant to aniline is 1.0, molar ratio of dopant to aniline is 1.2, reaction temperature is 0℃, reaction time is 4 h and reaction system is DMF/H2O (1:2, v/v). The highest conductivity of PANI/BC nanocomposites hits 5.1 S/cm. The as-prepared composites exhibited an optimum capacitance of 265 F/g at current density of 0.2 A/g.For PPy/BC nanocomposites, core-sheath hybrid fibres structures have been achived by wrapping homogenous layer of PPy onto BC nanofibers. The optimized reaction conditions were obtained as following:mass ratio of BC to pyrrole is 0.1, molar ratio of oxidant to pyrrole is 0.5, molar ratio of dopant to pyrrole is 1.2, reaction temperature is 0℃, reaction time is 6 h and reaction system is DMF/H2O (1:2, v/v). The highest conductivity of PPy/BC nanocomposites reaches 77.0 S/cm. The supercapacitor results indicated that PPy/BC omposites boasted a highest capacitance of 316 F/g at the current density of 0.2 A/g.By using fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analyser (TGA), field-emission gun scanning electronic microscope (FE-SEM), four-point probe technique and electrochemical work-station, etc, the as-prepared conducting polymer composites were chraterized in terms of structure, morphology, physio-chemical properties, conductivity and capacitance of the. In addition, the preparation mechanisms of conducting polymer/BC nanocomposites were illustrated by morphology and structure analysis of prepared composites. Through the research, conducting polymer/BC nanocomposites were successfully prepared and corresponding optimized reaction conditons have been obtained. The as-obtained conductive composites feature high conductivity, good capacitance, enco-friendlyness and good mechanical properties. This research offers a plateform for the design and exploitation of functional materials with more excellent performance, which may effectively promote the industrial realization and extending applications.