A Combined Field Ionisation/Electron Impact Ion Source for High Molecular Weight Samples of Low Volatility

1967 ◽  
Vol 22 (2) ◽  
pp. 121-123 ◽  
Author(s):  
C. Brunnée
Keyword(s):  
Molecular Weight ◽  
Electron Beam ◽  
High Molecular Weight ◽  
Electron Impact ◽  
Molecular Beam ◽  
Ion Source ◽  
Direct Inlet Probe ◽  
The Wire

A new combined field ionisation/electron impact ion source is described which can be used in connection with a direct inlet probe. The distance between the electron beam and the wire emitter is only one mm, sot hat the vapour of the sample reaches both ionizing zones. The vapour passes the ion source as a quasi molecular beam. Results obtained with this source will be given.

Effects of electron beam irradiation on structure and properties of ultra-high molecular weight polyethylene fiber

2017 ◽  
Vol 47 (6) ◽  
pp. 1357-1377 ◽  
Author(s):  
Dongliang Dai ◽  
Meiwu Shi
Keyword(s):  
Molecular Weight ◽  
Electron Beam ◽  
High Molecular Weight ◽  
Electron Beam Irradiation ◽  
Breaking Strength ◽  
Beam Irradiation ◽  
Elongation At Break ◽  
Gel Content ◽  
Ultra High Molecular Weight ◽  
Polyethylene Fibers

This study introduced trimethylolpropane trimethacrylate into ultra-high molecular weight polyethylene fibers through supercritical CO2 pretreatment before the fibers were irradiated under an electron beam. Significant differences, emerging in the ultra-high molecular weight polyethylene fibers’ gel content, mechanical properties, and creep property according to their different irradiation doses, were studied through one-way analysis of variance. Regression equations were established between the irradiation dose and the gel content, breaking strength, elongation at break, and creep rate by regression analysis. A reasonable irradiation dosage range was determined after a verification experiment and the impact trends were analyzed; additionally, the sensitized irradiation crosslinking mechanism of ultra-high molecular weight polyethylene fibers was preliminarily examined. Then the surface morphology, chemical structures, thermal properties, and crystal properties of treated ultra-high molecular weight polyethylene fibers were measured. The results showed that as the irradiation dose increased, the gel content first rose and then declined; the breaking strength decreased continuously; the elongation at break increased at first and then decreased; and the creep rate originally fell and then rose before finally declining slowly. Electron beam irradiation had a significant etching effect on the fibers’ surface, and both the melting point and crystallinity decreased slightly.

Electron-beam-induced changes in ultra-high-molecular weight polyethylene

2010 ◽  
Vol 165 (4) ◽  
pp. 277-289 ◽  
Author(s):  
R. D. Mathad ◽  
H. G. Harish Kumar ◽  
Basavaraj Sannakki ◽  
Ganesh Sanjeev ◽  
K. S.S. Sarma ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Electron Beam ◽  
High Molecular Weight ◽  
Induced Changes ◽  
Ultra High Molecular Weight
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