Alkali lignin, a by-product of commercialized paper making process, is an abundant and environmental-friendly material. In this paper, polyacrylontrile (PAN) -based hollow fiber was fabricated by one-step wet-spinning technique through blending with alkali lignin at different ratios. The phase diagram of the blends was determined by titration method. When alkali lignin is added into the PAN solution, the clouding points move away from polymer-DMSO axis, and miscibility gap increases. The phase separation of PAN was slowed down by mixing with alkali lignin which resulted in the formation of hollow structure and promoted the pore formation in the wall. This work clearly explains the roles that alkali lignin plays in the system consisting of polymer, solvent and nonsolvent, and provides a feasible method to produce PAN-based hollow fibers.

碱木质素是商业化造纸工艺的副产品，是一种丰富且环保的材料。本文通过一步法湿纺技术，通过与碱木质素按不同比例共混制备聚丙烯腈（PAN）基中空纤维。共混物的相图通过滴定法确定。当将碱性木质素添加到PAN溶液中时，浊点移离聚合物-DMSO轴，并且混溶间隙增大。通过与碱木质素混合减慢PAN的相分离，导致形成空心结构并促进壁中的孔形成。这项工作清楚地说明了碱性木质素在由聚合物，溶剂和非溶剂组成的体系中所起的作用，并为生产基于PAN的中空纤维提供了可行的方法。