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  

Preparation of Bacterial Nanocellulose Based Conductive Functional Composites and Its Application in Conductive Paper

作　　者：高璐 聂子琪 陈琳 洪枫[1,2,3] GAO Lu;NIE Ziqi;CHEN Lin;HONG Feng(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University,Shanghai 201620,China;College of Biological Science and Medical Engineering,Donghua University,Shanghai 201620,China;Scientific Research Base of Bacterial Nanofiber Manufacturing and Composite Technology,China Textile Engineering Society,Shanghai 201620,China)

机构地区：[1]纤维材料改性国家重点实验室(东华大学),上海201620 [2]东华大学生物与医学工程学院,上海201620 [3]中国纺织工程学会细菌纳米纤维制造及复合技术科研基地,上海201620

出　　处：《纤维素科学与技术》2024年第1期9-18,F0002,I0001,共12页Journal of Cellulose Science and Technology

基　　金：中央高校基本科研业务费专项资金资助项目(2232019A3-08)。

摘　　要：以具有三维纳米纤维网络结构的细菌纤维素(BNC)为支撑基底,碳纳米管(CNT)或聚吡咯(PPy)为填充导电材料,通过原位生物培养复合制备导电功能复合材料,并将其应用于导电纸。采用了静态浅瓶培养、动态水平转鼓培养,以及氧化聚合法制备了多种BNC基导电功能复合材料,并对各导电复合膜的产量、宏观及微观(SEM)形貌、力学性能、结晶度、比表面积、导电性能等进行表征,探究最优的制备方式及反应条件,制备出性能优异的BNC基导电纸。结果表明,水平动态转鼓的发酵方式使得CNT的分布更均匀,动态制备的D-BNC/CNT复合膜的电导率随着CNT的负载量增加而增加,质量浓度为1%(wt)的D-BNC/CNT复合膜的电导率(0.94 S/cm)约为静态制备的S-BNC/CNT(0.015 S/cm)的62倍。氧化聚合法制备的D-BNC/PPy导电复合膜,在浓度为0.4%(wt)时力学性能(杨氏模量为3.65 MPa)与导电性能(电导率为0.14 S/cm)最优。D-BNC/1%(wt)CNT/0.4%(wt)PPy导电纸与市售的导电纸相比,导电性能具有明显的优势(二极管的光亮强度更大),导电率达到2.87 S/cm,并且具有超高的柔韧性。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.

关 键 词：细菌纳米纤维素 碳纳米管 聚吡咯 水平转鼓反应器 导电纸 

分 类 号：TB332[一般工业技术—材料科学与工程] Q81[生物学—生物工程]