摘要
利用乙酸酐/4-二甲基氨基吡啶(DMAP)/LiCl均相体系对粉单竹经碱提提取的单竹木聚糖进行乙酰化,制备了乙酰化木聚糖(AX),将其作为分散剂配制多壁碳纳米管(MWCNT)分散液,并涂布至纸张表面制成了纸基导电材料。基于1HNMR、GPC、XRD、动态光散射纳米颗粒分析仪、FESEM表征,考察了AX的乙酰基取代度对MWCNT分散液分散性能的影响,通过电化学工作站评价了导电纸的循环伏安、交流阻抗、恒电流充放电和循环稳定性等电化学性能。结果表明,乙酰基取代度为0.2960时,由乙酸酐加入量为2.4 mL制备的AX4用于分散质量浓度为1 g/L的MWCNT分散液,其分散效率为64.4%,水合粒径为348.8 nm;以AX4为分散剂配制的MWCNT分散液涂布的导电纸电导率最高,为17.89 S/cm,质量比电容为4.37 F/g,循环1000次后比电容保留率为50%。
Acetic anhydride/4-dimethylaminopyridine(DMAP)/LiCl homogeneous system was employed to acetylate Bambusa chungii McClure xylan via alkali extraction to obtain acetylated xylan(AX),which was then used to disperse multi-walled carbon nanotubes(MWCNT),and the MWCNT dispersions formed were further coated on paper surface to fabricate paper-based conductive materials.The effect of acetyl substitution degree of AX on the dispersion performance of MWCNT was analyzed through 1HNMR,GPC,XRD,dynamic light scattering nanoparticle analyzer and FESEM characterization,while the cyclic voltammetry,alternating current impedance,constant current charge-discharge and cyclic stability of the conductive paper were evaluated by electrochemical workstation.The results showed that when AX4 with an acetyl substitution degree of 0.2960 prepared in acetic anhydride of 2.4 mL was used to disperse MWCNT with a mass concentration of 1 g/L,the dispersion efficiency reached 64.4%and the hydrated particle size was 348.8 nm.The conductive paper coated with MWCNT dispersion liquid with AX4 as dispersant exhibited the highest conductivity of 17.89 S/cm,a mass specific capacitance of 4.37 F/g,and a capacitance retention rate of 50%after 1000 cycles.
作者
刘晓欣
邝玥琳
宋涛
项舟洋
LIU Xiaoxin;KUANG Yuelin;SONG Tao;XIANG Zhouyang(State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China)
出处
《精细化工》
北大核心
2025年第9期1917-1923,2048,共8页
Fine Chemicals
基金
广州市科技计划项目(2023B03J1365)。
关键词
木聚糖
乙酰化
分散
碳纳米管
纸基导电材料
功能材料
xylan
acetylation
dispersion
carbon nanotubes
paper-based conductive materials
functional materials
