Positron annihilation in polymers containing halogen

Yuelie Lu; Manwei Zhang; Jianxian Song; Huilin Jiang

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Positron annihilation in polymers containing halogen

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- Positron annihilation in polymers containing halogen
- Nuclear Techniques Vol. 11, Issue 8, (1988)
- 作者机构：
  
  中国科学技术大学
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：25 May 1987，
  
  Published：1988-08
- 稿件说明：
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Yuelie Lu, Manwei Zhang, Jianxian Song, et al. Positron annihilation in polymers containing halogen[J]. Nuclear techniques, 1988, 11(8): 21-25.
DOI：

Yuelie Lu, Manwei Zhang, Jianxian Song, et al. Positron annihilation in polymers containing halogen[J]. Nuclear techniques, 1988, 11(8): 21-25. DOI：

摘要

用正电子湮没辐射一维角关联实验装置和正电子湮没寿命谱仪观察了全氟乙烯丙烯共聚物（FEP）系列试样和不同含氯量的聚乙烯系列试样的正电子湮没特性，并分别与聚四氟乙烯均聚物（PTFE）和聚乙烯（PE）进行了对照。结果表明：分子材料的介电性质对正电子湮没特性有明显的影响。极性基团的加入改变了分子链上的电荷密度分布，导致微观偶极电场的产生，使在自由体积内部或陷落在缺陷中的O-Ps正电子波函数与分子链上轨道电子波函数的重迭几率增加，长寿命τ

减小；同时，由于卤素原子的电负性较强，抑制了Ps的形成，增加了自由正电子的数目，使角关联曲线低动量成分减小。

Abstract

Using a one-dimensional positron annihilation angular correlation spectrometer

(FWHM

=0.33mrad) and a positron lifetime spectrometer

(FWHM

=0.305ns)

we have performed the measurements on the angular correlation and positron lifetime spectrum of the gamma rays produced by positron annihilation in a series of vinyl tetrafluoride-propenyl hexafluoride copolymers (F

) and a series of polyethylene containing different amount of chlorine. The results are Compared with those for PTFE and PE respectively.

关键词

Keywords

references

卢跃列等，第三届全国正电子湮没谱学会议论文， 1987 年。

P. Kirkegaard et al . , Comput. Phys. Commun. , 7 （ 1974 ）， 401 .

L. A. Wall et al . , J. Polym. Sci . , 8A （ 1970 ）， 1 ： 2441 .

蒋惠林等，核技术，（ 1986 ）， 11 ： 7 。

N. Koizumi et al . , J . Polym. Sci. C23 （ 1968 ）, 499 .

S. J. Tao , J . Chem . Phys . , 56 （ 1972 ）, 5499 .

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