Progress of Cryogenics and Isotopes Separation , ISSN: 1582-2575
2005, Volume 8, Issue 15+16

Evaluation by Quantum-Chemical Methods of Radiolysis Stability for Macromolecular Structures

Abstract

Thw behavior of macromolecular structures in ionizing fields was analyzed by cuanto chemical methods. In this study, the preliminary radiolytic effect was analized using a two-step radiolytic mechanism: a) ionization of molecule and spatial redistribution of atoms in order to reach a minimum value of energy, characteristic to the new quantum state; b) neutralization of molecule by capture of an electron and its rapid dissociation in free radicals. Chemical bond sustected to break are located in the distribution region of LUMO orbital and have minimal homolytic dissociation energies. Representative polymer structures (polyethylene, polypropylene, polystyrene, poly α and β polystyrene, polyisobuthylene, polytetrafluorethylene, polymethylsiloxanes) were analyzed.