纳米纤维素晶体物性对碳纳米管分散性及复合膜性能的影响  

Effects of physical properties of nanocellulose crystals on dispersion of carbon nanotubes and properties of their composite membranes

作　　者：汪力生 宋涛 岑钰 祁海松 韩亭亭 WANG Lisheng;SONG Tao;CEN Yu;QI Haisong;HAN Tingting(State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;Guangzhou Key Laboratory of Sensing Materials and Devices,Centre for Advanced Analytical Science,Guangzhou University,Guangzhou 510006,Guangdong,China)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640 [2]广州大学广州市传感材料与器件重点实验室,广东广州510006

出　　处：《精细化工》2025年第2期332-344,共13页Fine Chemicals

基　　金：中国科学技术基础资源调查项目(2019FY100900);国家自然科学基金项目(22204026)。

摘　　要：以柠檬酸和蔗渣漂白浆板为原材料制备了纳米纤维素晶体(CNCs),通过氯化铁调控CNCs长径比和表面羧基含量;以CNCs为分散剂对碳纳米管(CNTs)进行水相分散得到了CNTs-CNCs分散液,并制备了复合纳米膜(CNCs-CNMs)。结合SEM、EDS、TEM、FTIR、粒径分布和Zeta电位表征以及力学性能和电导率测试,考察了CNCs长径比和表面羧基含量对CNTs-CNCs分散液的分散性和CNCs-CNMs的拉伸强度、韧性和电导率的影响。结果表明,CNCs的加入及其长径比的减小和羧基含量的增高对CNTs-CNCs分散液的分散性以及CNCs-CNMs的力学和电学性能具有明显的促进作用。其中,CNCs长径比对CNCs-CNTs分散液的分散性以及CNCs-CNMs的力学性能的影响较羧基含量影响更大,CNCs-CNMs的拉伸强度、韧性和电阻变化率最高分别为72.8 MPa、2.5 J/m^(3)和33.3%;CNCs-CNMs羧基含量对CNCs-CNMs的导电性的影响更为直接,在CNCs长径比<50,羧基含量>0.65 mmol/g时,CNMs电导率均>20 S/cm。Cellulose nanocrystals(CNCs)were prepared from citric acid and bagasse bleached pulp board,with their length/diameter ratio and surface carboxyl group content regulated by ferric chloride.CNCs-CNTs dispersion liquid was obtained by aqueous dispersion of carbon nanotubes(CNTs)using CNCs as dispersant,and composite nanomembranes of CNCs-CNMs were further prepared.The effects of length/diameter ratio and surface carboxyl group content of CNCs on the dispersity of CNCs-CNTs and the tensile strength,toughness and electrical conductivity of CNCs-CNMs were analyzed via SEM,EDS,TEM,FTIR,particle size distribution and Zeta potential characterization as well as mechanical and electrical conductivity tests.The results showed that the addition of CNCs as well as the reduction in length/diameter ratio and the increase in carboxyl group content significantly improved the CNTs dispersity as well as the mechanical and electrical properties of CNMs.The length/diameter ratio of CNCs exhibited greater effect on the dispersion of CNCs-CNTs and the mechanical properties of CNCs-CNMs,with the highest tensile strength,toughness and resistance change rate of the CNCs-CNMs of 72.8 MPa,2.5 J/m^(3),and 33.3%,respectively,while the carboxyl group content of CNCs-CNMs displayed a more direct effect on the conductivity of CNCs-CNMs.When the length/diameter ratio of CNCs was less than 50 and the carboxyl group content was more than 0.65 mmol/g,the conductivity of CNMs was more than 20 S/cm.

关 键 词：导电聚合物复合材料 碳纳米管 纤维素纳米晶 分散性 力学性能 导电性能 功能材料 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ127.11[化学工程—无机化工]