On the effects of He+ ions bombardment of polyphenylacetylene |
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| Institution: | 1. Società Lupi arl, Chemical Research Institute, Via Casilina 1626/A, Rome 00133, Italy;2. Osservatorio Astrofisico di Catania, Via Santa Sofia 78, Catania 95123, Italy;1. College of Biochemical Engineering, Beijing Union University, Beijing, 100023, China;2. Beijing Hospital of Traditional Chinese Medicine, Capital Medical University, Beijing, 100010, China;1. Paris Descartes university, 75006 Paris, France;2. Inserm UMR S894, 75014 Paris, France;3. Service de neurophysiologie clinique, centre hospitalier Sainte-Anne, 1, rue Cabanis, 75014 Paris, France;4. Service de physiologie – explorations fonctionnelles, hôpital Henri-Mondor, Assistance publique–Hôpitaux de Paris, 94010 Créteil, France;5. EA 4391, excitabilité nerveuse et thérapeutique, faculté de médecine de Créteil, université Paris-Est-Créteil, 94010 Créteil, France;6. Department of Neurology, Philipps University, Marburg, Germany;7. Department of Neurology, Center for Neurorehabilitation,, Valens, Switzerland;1. Astronomical Institute of Slovak Academy of Sciences, SK-05960 T. Lomnica, Slovakia;2. INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy;3. Institut d’Astrophysique Spatiale (IAS), Université Paris-Sud, UMR 8617 – CNRS INSU, Bât 121, F-91405 Orsay, France;4. Laboratory Astrophysics Group of the Max Planck Institute for Astronomy at the Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 3, 07743 Jena, Germany;5. Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marquês de São Vicente 225, 22451-900 Rio de Janeiro, RJ, Brazil |
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| Abstract: | Polyphenylacetylene (PPA) thin films deposited on silicon substrates have been bombarded with a beam of 30 keV of He+ ions. The radiation damage of the film has been monitored by FT-IR spectroscopy at fluences between 0.8×1019 and 1.1×1020 ions/m2. The spectral changes undergone by the PPA film have been interpreted in terms of chain scission with formation of acetylenic and saturated end groups, and in terms of crosslinking reaction and extensive radiolytic degradation. The expected PPA cyclization reaction, a reaction which transforms a linear polymer into a ladder polymer has not been observed, although polystyrene (PS) is able to give this kind of reaction under somewhat similar conditions to those adopted in the present work. The results have been discussed in an astrochemical context in relation to the infrared emission spectra of certain astrophysical object and molecules present in the interstellar medium. |
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