湿纺工艺纺制PAN中空纤维成形机理研究  

Formation mechanism of PAN hollow fiber prepared by wet spinning process

作　　者：瓮龙明[1] 于洋[1] 徐樑华[1] 

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《合成纤维工业》2012年第1期26-30,共5页China Synthetic Fiber Industry

摘　　要：利用C型喷丝板进行挤出凝固,采用湿法纺丝工艺制备聚丙烯腈(PAN)中空纤维,从PAN/二甲基亚砜(DMSO)纺丝原液的流变性能和凝固过程的相分离两个方面探讨了PAN中空纤维的成形机理。结果表明:纺丝液随剪切速率(γ)的增加逐渐发生由粘性向弹性的转变是挤出胀大的主要原因,其粘弹转变点随着温度的升高而向高γ移动,在60℃下的纺丝液弧片接触成孔的理论临界γ为212 s^(-1);纺丝液在凝固浴中表层成膜是PAN-DMSO-H_2O三元体系相分离的结果,纺丝液细流表面成膜速度是影响孔结构闭合的重要因素,可以通过凝固浴浓度和凝固浴调节剂来控制。Polyacrylonitrile （PAN） hollow fiber was prepared using C-shaped spinnerets by wet spinning process. The formation mechanism of PAN hollow fiber was discussed from the aspects of the rheological behaivor and the phase separation of PAN/ dimethyl sulphoxide （DMSO） spinning dope during coagulation process. The result showed that the spinning dope was gradually transformed from viscouse state to elastic state while increasing the shear rate （ γ ）, which was the principal reason for the extrusion die-swell;the viscoelastic transition point shifted to high γ while raising the temperature; the theoretical critical γ was 212 s-1 for the formation of arc film to a hole of the spinning dope at 60 ℃ ; the phase separation of PAN-DMSO-H2O ternary system resulted in the surface film formation of spinning dope in coagulation bath; the surface film formation rate of spinning dope trickle was a critical factor affecting the closure of hole structure, which can be regulated through coagulation bath concentration and coagulation regulators.

关 键 词：聚丙烯腈纤维 中空纤维 挤出胀大 相分离 表层成膜速度 

分 类 号：TQ342.31[化学工程—化纤工业]