摘要
采用不同结构的二酐、二胺单体设计制备了含对称结构单元和含不对称结构单元的聚酰胺酸(PAA),通过静电纺丝分别制备PAA、聚丙烯腈(PAN)、PAA/PAN复合物的纳米纤维膜(ENFs),将ENFs在空气中热稳定化后,在1000℃的氮气气氛中碳化,制成不同前驱体的静电纺碳纳米纤维膜(ECNFs);研究PAA结构单元的对称性及PAA与PAN的复合对ENFs的热稳定化、碳化行为以及ECNFs导电性能的影响。结果表明:含不对称结构单元PAA的ENFs碳化收率较高,制备的ECNFs石墨微晶尺寸较大;将含不对称结构单元PAA与PAN复合时ENFs在1000℃碳化时质量保持率达45%,且得到的ECNFs的石墨微晶尺寸与平均堆叠层数分别达1.69 nm和4.71,优于其他前驱体的ECNFs的微晶结构;PAA中的不对称结构单元及其与PAN的复合都有助于提升ECNFs的电导率,复合物的ECNFs的电导率最高可达9.08 S/cm;含不对称结构单元PAA与PAN形成了良好的协同碳化效应,可促使ECNFs的石墨晶粒的堆积和生长,提高ECNFs的导电性能。
Polyamic acid(PAA)with symmetrical and asymmetric structural units was prepared by using dianhydride and diamine monomers with different structures.Nanofiber films(ENFs)of PAA,PAN and PAA/PAN composites were prepared by electrospinning process.Electrospun carbon nanofiber films(ECNFs)were prepared from ENFs with different precursors after heat stabilization in air and carbonization in nitrogen atmosphere at 1000℃.The effects of the symmetry of PAA structural unit and the composite of PAA and PAN on the thermal stabilization and carbonization behavior of ENFs and conductivity of ECNFs were studied.The results showed that PAA with asymmetric unit produced the higher carbonization yield of ENFs and contributed the larger graphite microcrystalline size to ECNFs;when PAA with asymmetric structural unit was combined with PAN,the mass retention rate of ENFs was 45%at a carbonization temperature of 1000℃and the graphite microcrystalline size and average stacking layers of ECNFs were 1.69 nm and 4.71 respectively,which were better than those of ECNFs from other precursors;the asymmetric structural units in PAA and their composition with PAN can enhance the conductivity of ECNFs with the maximum value of 9.08 S/cm;and the synergistic carbonization effect between PAA with asymmetric structural unit and PAN can promote the accumulation and growth of graphite grains and improve the conductivity of ECNFs.
作者
陈峒舟
赵刚
袁钦
徐剑
陈友汜
CHEN Tongzhou;ZHAO Gang;YUAN Qin;XU Jian;CHEN Yousi(Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Science,Ningbo 315201;Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215123;School of Chemical Engineering,Dalian University of Technology,Dalian 116024)
出处
《合成纤维工业》
CAS
2020年第4期11-17,共7页
China Synthetic Fiber Industry
基金
大连理工大学科研项目(DUT19RC(3)037)。
关键词
碳纤维膜
聚酰胺酸
聚丙烯腈
静电纺丝
电导率
carbon fiber film
polyamic acid
polyacrylonitrile
electrospinning
conductivity
