纺丝溶液的挤出对聚丙烯腈初生纤维表面形态的影响  

Effect of spinning solution extrusion on the surface morphology of polyacrylonitrile as-spun fibers

作　　者：苏华[1] 杨晨[1] 薛一萌[1] 徐樑华[1] 童元建[1] 

机构地区：[1]北京化工大学材料科学与工程学院碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2012年第4期52-57,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家"973"计划(2011CB605601/2011CB605602)

摘　　要：采用旋转流变仪并结合Tanner黏弹性流体挤出胀大方程研究了剪切对聚丙烯腈/二甲基亚砜(PAN/DM-SO)溶液挤出胀大的影响,用原子力显微镜(AFM)研究了挤出速度对PAN初生纤维表面粗糙度的影响规律。结果表明:随着挤出速度的增大,体系的挤出胀大比逐渐增大,当挤出速度大于90m/h时,挤出胀大比的变化出现拐点,增大的趋势变缓;聚合物大分子链的回复是初生纤维表面形貌形成的主要原因,湿法纺丝过程中,挤出速度低于90m/h时初生纤维表面粗糙度随着挤出速度增加而减少,在较高挤出速度时,随着挤出速度增加而增加;干湿法纺丝初生纤维的表面粗糙度明显低于湿法纺丝,并且随挤出速度的增加而增大。The effect of shearing on the extrusion die swelling of solutions of polyacrylonitrile in dimethylsulfoxide （PAN/DMSO） has been modeled by the Tanner equation using rheological data, and the effect of the extrusion speed on the surface roughness of PAN as-spun fibers was investigated by atomic force raicroscopy. The results showed that the extrusion die swelling of PAN/DMSO solutions was more obvious at higher extrusion speeds. The surface roughness of the PAN as-spun fibers was dependent on the recovery of PAN macromolecules after the PAN/ DMSO solution was extruded from the spinneret. For wet spinning, the surface roughness ,of the as-spun fiber de- creased with increasing extrusion speed, until the extrusion speed reached 90 m/h, after which rougher surfaces were observed at higher extrusion speeds. For a dry-jet wet spinning process, the surface roughness of PAN as-spun fibers was significantly lower than for the wet spinning process, and increased slightly with increasing extrusion speed.

关 键 词：PAN/DMSO溶液 挤出胀大 初生纤维 表面粗糙度 

分 类 号：TQ342.31[化学工程—化纤工业]