Positron Spectroscopy of Free Volume in Poly(vinylidene fluoride) after Helium Ions Irradiation

Jin-Zhe Lyu; Roman Laptev; Natalya Dubrova

doi:10.1007/s10118-019-2195-2

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Positron Spectroscopy of Free Volume in Poly(vinylidene fluoride) after Helium Ions Irradiation

ARTICLE | Updated：2021-02-18

- Positron Spectroscopy of Free Volume in Poly(vinylidene fluoride) after Helium Ions Irradiation
- Positron Spectroscopy of Free Volume in Poly(vinylidene fluoride) after Helium Ions Irradiation
- Chinese Journal of Polymer Science 2019年37卷第5期页码：527-534
- Affiliations：
  
  Division for Experimental Physics, School of Nuclear Science & Engineering, National Research Tomsk Polytechnic University, Lenina Ave. 43, Tomsk 634034 Russia
- Author bio：
  
  2891796456@qq.com
- Funds：
  
  The authors are grateful to senior researcher of the laboratory of isotopic analysis and technology TPU Sohoreva V.V. for irradiating samples. The research is carried out within the framework of the grant of the Program for Enhancing Competitiveness of Tomsk Polytechnic University.
- DOI：10.1007/s10118-019-2195-2
  中图分类号：
- 收稿：2018-09-04，
  
  修回：2018-10-24，
  
  录用：2018-10-30，
  
  网络首发：2018-12-05，
  
  纸质出版：2019-05
- Accepted：
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Citation: Lyu, J. Z.; Laptev, R.; Dubrova, N. Positron spectroscopy of free volume in poly(vinylidene fluoride) after helium ions irradiation. Chinese J. Polym. Sci. 2019, 37, 527–534

Jin-Zhe Lyu, Roman Laptev, Natalya Dubrova. Positron Spectroscopy of Free Volume in Poly(vinylidene fluoride) after Helium Ions Irradiation[J]. Chinese Journal of Polymer Science, 2019, 37(5): 527-534.
Citation: Lyu, J. Z.; Laptev, R.; Dubrova, N. Positron spectroscopy of free volume in poly(vinylidene fluoride) after helium ions irradiation. Chinese J. Polym. Sci. 2019, 37, 527–534 DOI： 10.1007/s10118-019-2195-2.

Jin-Zhe Lyu, Roman Laptev, Natalya Dubrova. Positron Spectroscopy of Free Volume in Poly(vinylidene fluoride) after Helium Ions Irradiation[J]. Chinese Journal of Polymer Science, 2019, 37(5): 527-534. DOI： 10.1007/s10118-019-2195-2.

摘要

Abstract

Free volume is an extremely important intrinsic defect in polymers. Structurally

free volume is the randomly distributed holes in the polymer molecular chain segments. In proton exchange membrane fuel cells

free volume is also the space needed for the directional conduction of protons. Irradiation by

particles to grafting sulfonated poly(vinylidene fluoride) (PVDF) is one of the methods to produce proton exchange membrane with good proton channel rate. Positron annihilation lifetime spectroscopy was used to study the free volume size at different absorbed dose levels from 0.13 MGy to 0.65 MGy. Measurement method of positron annihilation lifetime spectroscopy for PVDF based on

Ti positron source was developed. For low dose irradiation at 0.26 MGy

a decrease in free volume and practically unchanged crystallinity were observed. Further increase of absorbed dose range from 0.26 MGy to 0.39 MGy led to an increasing crystallinity with the same free volume level. For the absorbed dose from 0.39 MGy to 0.65 MGy

crystallinity was decreased but free volume remained almost constant.

关键词

Keywords

references

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