| |
 |
UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 14:08 |
 |
|
|
|
Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Polymer Physics
Title:
Radiation Induced Degradation on Polymeric Materials in High-Energy Environment
Authors:
Codrut CHERESTEs, Margareta CHERESTEs, Livia Maria CONSTANTINESCU
Affiliation:
Faculty of Physics, University of Bucharest, PO Box MG-11,
Măgurele, Bucharest
E-mail
codrut.cherestes@dozimed.ro
Keywords:
degradation, radiation, polymer
Abstract:
The utilization of polymeric materials and their optimization for high performance applications requires a detailed understanding of their degradation sensitivities, and the various features affecting durability. Modeling methods are also required for predicting the chemical stability of macromolecular materials used in the high-energy radiation environment, for establishing degradation mechanism and investigate cross-linking, main-chain scission and elimination products. The analysis of the specific polymer degradation product and changes in average molecular weight (Mw) is performed using chemical analysis (FTIR) and thermal analysis. The analytical result for polymer radiation-induced degradation products demonstrate that, depending on Mw, the amount and types of degradation products will vary with respect to cross-linking and chain scission. During the radiation event, the energy flux and spectrum of the particle or photon radiation provides a dose of ionizing radiation that yield a number of ionization per unit area of polymeric material. The molecular formula and structure of the polymer determine the kinetics of the degradation following ionization. One method for applying kinetics to the study of radiation-induced degradation is the radiation yield value which uses the products formed through polymer degradation as the baseline for describing the rate equation as a function of absorbed energy.
The current trends in this research field related prediction methodologies for material lifetime, new insight into degradation mechanisms in radiation environments, and how the knowledge of degradation processes can be applied to the design of materials with improved performance.
|
|
|
|