基于细菌纤维素的导电功能复合材料的制备及用于导电纸OA

Conductive functional composites were prepared by in-situ bio-synthesis using bacterial nanocellulose(BNC)as a supporting substrate as well as using carbon nanotube(CNT)and polypyrrole(PPy)as filling conductive materials into the ultra-high three-dimensional nano-fibril network structure of BNC.The conductive properties of the composites were finally evaluated by application in conductive paper.A variety of BNC-based conductive functional composite materials were prepared by using static culture(S-BNC),dynamic horizontal drum fermentation(D-BNC)and oxidative polymerization,respectively.The yield,macro and micro(SEM)morphology,mechanical properties,crystallinity,specific surface area and conductive properties of each conductive composite membrane were characterized.The optimal preparation methods and reaction conditions were investigated to prepare BNC-based conductive paper with excellent properties.The results showed that the horizontal dynamic drum fermentation made the distribution of CNT more uniform.The conductivity of D-BNC/CNT composite membrane increased with the increase of CNT loading.The conductivity of D-BNC/CNT composite membrane with mass concentration of 1%(wt)(0.94 s/cm)was about 62 times than that of S-BNC/CNT(0.015 s/cm).When the PPy concentration was 0.4%(wt),the mechanical properties(Youngʼs modulus was 3.65 MPa)and conductivity of the D-BNC/PPy composite prepared by oxidative polymerization was 0.14 s/cm.Compared with a commercially available conductive paper,D-BNC/1%(wt)CNT/0.4%(wt)PPy conductive paper demonstrated obvious advantages in conductivity(higher brightness intensity of diode),the conductivity reaches 2.87 s/cm and ultra-high flexibility.