自由电子激光对芳香聚酰胺纤维热处理的研究

用红外自由电子激光方法处理芳香聚酰胺纤维.  实验结果表明, 芳香聚酰胺纤维在自由电子激光辐照时在外力拉伸下可出现“缩颈”现象. 红外光谱研究结果表明, 经自由电子激光处理的芳香聚酰胺纤维样品未出现热裂解. 这种方法有可能发展成一种热处理芳香聚酰胺纤维的新方法.

Application of Free Electron Laser in Aramid Processing

Because the melting temperature of aramid is higher than its thermo-decomposition temperature,processing of aramid fiber in the molten state is not feasible.Here we propose an approach to process aramid fiber using infrared Free Electron Laser(FEL).The temporal structure of the FEL pulses allows the fiber to be excited to higher vibrational levels so that the polymer becomes soft enough to be processed without significant thermo-decomposition.Microscopic observation using convention optical microscope and polarized technique shows that !necking phenomenon" and re-orientation occur on an aramid fibrous sample that was treated with FEL under external strain.In comparison with the the sample without treatment of FEL,significant changes are observable on the morphology of the broken aramid fiber treated with FEL.The above results strongly suggest that the aramid fiber is molten under the excitation of FEL. FTIR spectroscopic studies show that no thermal decomposition was observed on the aramid sample after FEL treatment. The above result may be helpful to develop a new way to process aramid in the future.