木质素/聚丙烯腈复合纤维的制备及其性能

Preparation and properties of lignin/polyacrylonitrile composite fibers

为降低传统聚丙烯腈(PAN)纤维的制备成本并实现木质素的高值化利用,对木质素/PAN共混溶液的黏度进行研究,采用湿法纺丝工艺制备了不同比例的木质素/PAN复合纤维,确定其最佳纺丝工艺。借助扫描电子显微镜、差示扫描量热/热重同步分析仪、单纤维物性分析仪、紫外-可见分光光度计等测试手段对复合纤维的结构和性能进行研究。结果表明:相对含量为35%的木质素/PAN纤维仍具有均匀致密的结构,其强度达到3.81 cN/dtex;加入木质素后,二者的协同作用赋予了复合纤维良好的热稳定性,该复合纤维在低成本碳纤维和功能纺织材料等领域具有重要的潜在应用价值。

In order to reduce the preparation cost of existing polyacrylonitrile(PAN)fiber and achieve high value utilization of lignin,different proportions of lignin were used to prepare the lignin/PAN fibers employing the wet spinning process based on the understanding of viscosity of lignin/PAN blending solution,and the results from this work were used to identify the optimal spinning process.The structure and properties of the composite fibers were investigated by scanning electron microscopy,differential scanning calorimetry/thermal resynchronization analyzer,single fiber physical property analyzer,and UV-visible spectrophotometer.The results show that the lignin/PAN fiber with 35%lignin remains a uniform and dense structure,and its strength can reach 3.81 cN/dtex.After the addition of lignin,the synergistic effect of the two gives the composite fiber good thermal stability.The composite fiber has important potential application value in the fields of low cost carbon fiber and functional textile materials.