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3 - Interaction of ion beam with polymer: chemical picture

Alexey Kondyurin ; Marcela Bilek

Ion Beam Treatment of Polymers, 2008, p.29-73

Elsevier Ltd

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  • Título:
    3 - Interaction of ion beam with polymer: chemical picture
  • Autor: Alexey Kondyurin ; Marcela Bilek
  • É parte de: Ion Beam Treatment of Polymers, 2008, p.29-73
  • Descrição: Polymer is formed by long macromolecules with high molecular mass or a network of macromolecules. A polymer macromolecule is formed by jointed monomers—regular units of the polymer chain. It is stable when there is no external destruction influence. Under external influence (for example, UV light or ion beam) some bonds are dangled and a macromolecule is transformed into a free radical state. Such free radicals are very active and cause a number of chemical reactions in polymers. Ion beam implantation generates specific kinds of radicals. When a high-energy ion collides with a macromolecule, the atom leaves its position and moves at high speed away from the parent macromolecule. After a number of collisions and loss of kinetic energy the atom is stopped between polymer macromolecules. After completion of ion beam implantation the modified layer of the polymer is unstable. If a modified polymer is used after ion beam implantation in high vacuum, the free radical reactions continuing in the modified layer do not significantly change the structure of the polymer. However, the modified polymer is usually taken away from the vacuum chamber and used in air or in another active environment. The chemical reactions in polymers after ion beam implantation have multipath characteristics. The propagation paths, rates, and products of the reactions are difficult to predict in terms of polymer type, ion beam parameters, and post-history of the polymer. Ion beam implantation is an exception when considering the high concentration of active free radicals at high local temperature at the same time, in small volume.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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