Citation: 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 shu

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

Division for Experimental Physics, School of Nuclear Science & Engineering, National Research Tomsk Polytechnic University, Lenina Ave. 43, Tomsk 634034 Russia

Corresponding author: Jin-Zhe Lyu, 2891796456@qq.com
Received Date: 4 September 2018
Revised Date: 24 October 2018
Accepted Date: 1 January 2018
Available Online: 5 December 2018

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 α 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 ⁴⁴Ti 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.
- Positron annihilation,
- Free volume,
- XRD,
- Poly(vinylidene fluoride),
- Helium ions,
- Connection,
- Degradation
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