摘要
为进一步降低熔体微分电纺的纤维直径,使其达到纳米尺度,在现有直线狭缝电纺喷头的基础上设计了可以使高速气流汇聚的“V”形风道,通过高速气流对熔体微分射流进行二次牵伸细化。采用实验研究和数值模拟相结合的方法,以射流间距和喷头端电场强度为指标,研究了“V”形风道结构、材质对电纺微分射流的影响。研究结果表明,风道结构会不可避免地削弱喷头端的电场强度、降低射流的效率。增加风刀与喷头尖端的头端凸出量以及采用不导电的聚醚醚酮作为风刀材质都可以有效地降低风刀对射流效率的影响,而风道的宽度对喷头端电场强度影响不大。在优化的风刀结构和材质的基础上,成功制备了平均直径为825 nm的熔体电纺超细纤维。研究证实在气流辅助牵伸的作用下,直线狭缝电纺能够实现熔体电纺超细纤维的批量制备。
In order to refine the polymer melt fibers that were fabricated by melt electrospinning,a V-shaped airflow tunnel was designed based on the existing linear slot electrospinning nozzle.The V-shaped airflow tunnel could make the high-speed airflow converge at the end lower points,which acted a strong drag-force on the surface of polymer fibers,and thus could refine the fiber into nanoscale.The effects of wind knife material and structure on the inter-jet distance and electric field were investigated by experiment and numerical simulation.The results show that the airflow channel will inevitably weaken the electric field strength of the nozzle end.However,the influence of the airflow channel on electric field can be effectively reduced by using the air knife made of PEEK material or increasing the head end protrusion.The width of the air knife has little effect on the electric field intensity at the nozzle end.The average diameter of melt electrospun fiber was reduced to 825 nm by optimizing the structure and material of wind knife.The research proved that melt differential electrospinning based on linear slot spinneret have the ability to fabricate melt ultrafine fibers in large scale with the help of airflow-assisted stretching.
作者
陈明军
马丽
张有忱
李好义
詹瑾
杨卫民
Chen Mingjun;Ma Li;Zhang Youchen;Li Haoyi;Zhan Jin;Yang Weimin(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Taiyuan Research Institute Co.Ltd.of China Coal Science and Industry Group,Taiyuan 030001,China;Shanxi Fenxi Mining(Group)Co.,Ltd.,Jiexiu 032000,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2021年第1期86-90,共5页
Engineering Plastics Application
基金
国家重点研发计划(2016YFB0302002)。
关键词
超细纤维
熔体微分电纺
电场强度
气流
射流
ultra-fine fiber
melt differential electrospinning
electric field strength
airflow
jets
