Application of  Free Electron Laser in Aramid Processing

Chem. J. Chinese Universities ›› 2006, Vol. 27 ›› Issue (1): 140.

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Application of Free Electron Laser in Aramid Processing

WU Yan-Jie _1,2, YANG Li-Min⁴, XU Yi-Zhuang ^1* , YANG Xue-Ping³, LI Yong-Gui³, WANG Ming-Kai³, WANG Du-Jin ², WU Jin-Guang ¹, XU Duan-Fu ^1,2

1. State Key Laboratory of Rare Earth Material Chemistry and Applications,
Department of Chemistry, Peking University, Beijing 100081, China;
2. State Key Laboratory of Polymer Physics & Chemistry, Joint Laboratory of Polymer Science and Materials,
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
3. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100080, China;
4. Institute of Heavy Ion Physics, Peking University, Beijing 100871, China

Received:2004-10-19 Online:2006-01-10 Published:2009-01-10
Contact: XU Yi-Zhuang ,E-mail: xyz@pku.edu.cn

Abstract

Abstract:

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.

Key words: R-FEL; Aramid fiber; Necking phenomenon

CLC Number:

O641

TrendMD:

WU Yan-Jie, YANG Li-Min, XU Yi-Zhuang, YANG Xue-Pingng, LI Yong-Gui, WANG Ming-Kai, WANG Du-Jin, WU Jin-Guang, XU Duan-Fu. Application of Free Electron Laser in Aramid Processing[J]. Chem. J. Chinese Universities, 2006, 27(1): 140.

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Application of Free Electron Laser in Aramid Processing

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