PAN基碳纤维原丝表面形态控制研究

Surface morphology control of PAN precursor fiber

采用扫描电子显微镜(SEM)表征PAN原丝表面沟槽形态,通过凝固浴φ(二甲基亚砜)、温度、pH值、负牵伸倍数的变化对PAN原丝的表面沟槽形态进行控制。结果表明在一定范围内凝固浴φ(二甲基亚砜)的提高、凝固浴温度的降低、凝固浴pH值的提高、凝固浴负牵伸倍数的增加都有利于制备表面沟槽更深的PAN原丝。碳纤维表面沟槽一方面对纤维表面造成一定的机械损伤,另一方面可以提高碳纤维的界面结合力,所以适宜的表面沟槽才能使碳纤维的力学性能得以充分发挥。

The surface morphology of PAN precursor fibers was characterized by scanning electron microscope(SEM).It could be controlled by the changes of the coagulation conditions,such as the concentration,the temperature,the pH value and the minus stretch ratio.The results showed that the increase of the coagulation bath concentration,the pH value and the minus stretch ratio or the decrease of the temperature is conducive to the preparation of fiber with deeper surface grooves.On the one hand the surface groove of carbon fiber could cause certain mechanical damage,on the other hand it could improve the interface binding force.Suitable fiber surface groove can make the mechanical properties of the fiber fully played.