Artigo Revisado por pares

LET effect on cross-linking and scission mechanisms of PMMA during irradiation

1999; Elsevier BV; Volume: 55; Issue: 3 Linguagem: Inglês

10.1016/s0969-806x(99)00184-x

ISSN

1879-0895

Autores

E.H Lee, Gopal R. Rao, L.K. Mansur,

Tópico(s)

Diamond and Carbon-based Materials Research

Resumo

Mechanisms of scission and cross-linking are investigated for poly(methyl methacrylate) subjected to various irradiation sources, such as low LET radiation sources (MeV e-beams, Co60 γ-rays) and high LET ions (MeV He+, Ar+). PMMA properties were degraded upon irradiation by e-beam and γ-rays, but were improved upon bombardment with high energy ion beams (HEIB) as a result of cross-linking. The results indicate that high LET produces a high concentration of free radicals over many neighboring molecular chains, facilitating track overlap and enhancing cross-linking over scission, while low LET affects only a single molecular chain, leading to chain scission.

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