摘要
采用高速摄像法对熔体静电纺丝射流下落的动态变化规律进行研究,并采用酚醛微球作为射流的标记粒子,观察和测量射流的下落距离和拉伸率,发现射流下落过程为三维鞭动过程,存在直线下落阶段、不稳定阶段和固化阶段三个阶段。研究了不同电压时,射流下落过程中鞭动的摆动角和摆动半径的变化,并与实验测量的沉积面积比较,发现随着电压的增大,鞭动不断减小。同时,研究了射流的拉伸细化规律,发现存在三段形态变化模式:一端拉伸、多点受力的拔河式拉伸、固化稳定。
The dynamics of jet falling process during melt electrospinning was studied using high-speed camera.Phenolic microspheres were chosen as marking particles of the flying jets to observe and measure the falling distance and draw ratio.The results showed that it was three dimensional dynamic process with whipping motion and had three stages of plummeting stage,unstable stage and curing stage.Changes of swinging angle,swinging radius and deposition area of experimental resultant fibrous film during the jet falling process under different applied voltages were studied.It was found that whipping motion of flying jets was suppressed with the increase of the applied voltage.Stretching and thinning mechanism of the flying jets were also investigated.It was found that the flying jets underwent three distinct morphological changes,namely stretching from one end,tug of war-style stretching and solidification.
出处
《高分子通报》
CAS
CSCD
北大核心
2014年第4期44-49,共6页
Polymer Bulletin
关键词
熔体静电纺丝
高速摄像法
射流下落过程
鞭动
拉伸细化原理
Melt electrospinning
High-speed camera
Jet falling process
Whipping motion
Stretching and thinning mechanism
