波谱学杂志 ›› 2009, Vol. 26 ›› Issue (1): 83-87.

• 研究论文 • 上一篇    下一篇

新疆长绒棉辐射效应的谱学研究

赵新1,2*; 邹琴2; 孙万赋1; 唐军1   

  1. (1.新疆大学 理化测试中心,新疆 乌鲁木齐 830046;2.中国科学院 武汉物理与数学研究所,湖北 武汉 430071)
  • 收稿日期:2008-09-26 修回日期:2008-11-14 出版日期:2009-03-05 发布日期:2009-12-05
  • 通讯作者: 赵新

Radiation Effects on Xinjiang Long-staple Cotton Fiber Studied by Magnetic Resonance Techniques

ZHAO Xin1,2*; ZOU Qin2; SUN Wan-fu1; TANG Jun1   

  1. (1.Analysis and Research Center, Xinjiang University, Urumqi 830046, China;
    2.Wuhan Institute of Physics and Mathematics, the Chinese Academy of Sciences, Wuhan 430071, China)
  • Received:2008-09-26 Revised:2008-11-14 Online:2009-03-05 Published:2009-12-05
  • Contact: ZHAO Xin

摘要: 13C CP/MAS NMR谱、ESR谱和质子弛豫时间等方法,研究了经γ射线在室温下辐照后新疆长绒棉纤维的辐射效应. 结果表明随着辐照剂量的增加,长绒棉纤维内的自由基浓度明显的增大,并产生了多种自由基的混合物. 由辐照前后的长绒棉纤维的13C CP/MAS NMR谱可以得出,随着辐射剂量的增加,C1峰的谱宽趋向增宽,表明了自由基存在的位置. 各类弛豫时间的改变则反映出长绒棉纤维内部聚集态结构和大分子链运动随辐射剂量的变化.

关键词: 新疆长绒棉, 核磁共振(NMR), 13C CP/MAS NMR谱, ESR谱, 弛豫时间

Abstract: The irradiation effects on the aggregate state and microstructure of Xinjiang long-staple cotton fiber were studied by solid state 13C CP/MAS NMR, 1H relaxation time measurements and ESR spectroscopy. The results showed that the microstucture of the long-staple cotton fiber were not altered after 5 Gy γ irradiation, while the crystallization state of the cotton fiber changed significantly under 75 Gy γ irradiation. It was also shown that γ irradiation induced production of different types of free radicals whose concentrations increased with the irradiation dose. The results of 1H NMR relaxation time measurements suggested that γ irradiation could cause changes of molecular motions in the Xinjiang long-staple cotton fiber.

Key words: NMR, long-staple cotton fiber, 13C CP/MAS NMR spectra, ESR, relaxation time

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