Other
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..649b&link_type=abstract
In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla
Other
Space Environment, Materials, Radiation Effects
Scientific paper
Protons affect the polymers mainly through scission and crosslinking of macromolecule chains. Ionization processes at proton non-elastic scattering define these effects. One of the most important problems of radiation physics and chemistry of polymers is dependence of radiation effects in polymers on the kind of ionizing radiation or the problem of LET (Linear Energy Transfer) effect. Analyze of such dependence for protons and some other kinds of radiation is presented. A detailed examination of 100 MeV proton collisions in polyethyleneterephtalate (PETP, trade mark Mylar) on the base of the sample heat conductivity behavior revealed an important role of atom displacements resulting from elastic nuclear scattering. Similar results were obtained for polymethylmethacrylate irradiated by low energy protons. It is necessary also to take into account the establishing clusters of displaced atoms. Such damage of polymer molecules was not obtained for other examined types of radiation, in particular, for recoil nuclei at reactor neutron irradiation and for 60Co - gamma radiation.
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