Pulse and continuous ion beam treatment of polyethylene

• Polyethylene (PE) films were treated by a nitrogen ion beam with an energy of 20 keV at a quasicontinuous regimewith low current density and at a pulse-periodical regime with high current density. IR ATR spectra and UV spectrashowed significant differences in structural changes of PE treated by pulse and continuous treatment at the sameaverage current density. The changes in the molecular structure that are induced by ion beams, i.e. the appearance ofaromatic cycles, unsaturated bonds and carbonyl groups in PE, have a similar qualitative character for all types of ionbeam regimes. However, the same degree of structural changes is achieved at lower dose in the pulse regime than in thecontinuous regime. At equal treatment parameters (ion energy, dose treatment, average current density) the pulseregime leads to a higher concentration of unsaturated and oxygen-containing groups then the continuous regime. Thiseffect at the pulse regime can be explained by the high current density in the single pulse, at which a high localtemperature is generated in the ion track field of the polymer. Probably this leads to a wave of internal stress, and theseeffects additionally stimulate structural changes in the polymer at pulsed ion beam treatment.

Ämnesord

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

ion beam treatment

IR spectroscopy

polyethylene

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