Artículo
Monte Carlo study of molecular weight distribution changes induced by degradation of ion beam irradiated polymers
Chappa, Veronica Cecilia
; Pastorino, Claudio
; del Grosso, Mariela Fernanda
; Arbeitman, Claudia Roxana
; Müller, M.; Garcia Bermudez, Gerardo Jose
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Fecha de publicación:
10/2010
Editorial:
Elsevier Science
Revista:
Nuclear Instruments and Methods in Physics Research B: Beam Interactions with Materials and Atoms
ISSN:
0168-583X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In this work we study a polymeric material that degrades upon irradiation due to the energy inhomogeneously deposited by heavy ion beams. Ion beam irradiation of polymers generates rather different effects than those induced by "classical" low ionizing particles such as electrons or gamma rays. This is due to the high electronic stopping power and the inhomogeneous distribution of deposited energy. This energy is transferred to the material within a small volume along the ion path forming the so called "nuclear track" or "latent track". The track size primarily depends on the ion velocity, and it is determined by the secondary electrons (delta rays) generated along the ion trajectory. By means of Monte Carlo simulations we first obtained equilibrated polymer configurations using a coarse-grained model, and then investigated the spatially inhomogeneous chain scission process due to the passage of the ions. The number average molecular weight, weight average molecular weight and the polydispersity were calculated as a function of track radius, scission probability within the ion track and irradiation fluence. Finally we compared our results with a numerical implementation of a model for random homogeneous degradation.
Palabras clave:
ION BEAM IRRADIATION
,
MC SIMULATION
,
MOLECULAR WEIGHT DISTRIBUTION
,
POLYMERS
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Identificadores
Colecciones
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Chappa, Veronica Cecilia; Pastorino, Claudio; del Grosso, Mariela Fernanda; Arbeitman, Claudia Roxana; Müller, M.; et al.; Monte Carlo study of molecular weight distribution changes induced by degradation of ion beam irradiated polymers; Elsevier Science; Nuclear Instruments and Methods in Physics Research B: Beam Interactions with Materials and Atoms; 268; 19; 10-2010; 3235-3238
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