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Effect of molecular weight on the physicochemical modifications induced in the UV laser ablation of doped polymers

AuthorsRebollar, Esther ; Bounos, J.; Oujja, M. ; Georgiou, S.; Castillejo, Marta
Issue Date1-Apr-2007
PublisherIOP Publishing
CitationJournal of Physics: Conference Series 59: 193-197 (2007)
AbstractThis work investigates the effect of polymer molecular weight MW on the UV ablation of iodo-naphthalene- and iodo-phenanthrene-doped poly(methyl methacrylate) PMMA, and polystyrene PS films following irradiation at 248 nm. For irradiation at weakly absorbed wavelengths, the ablation threshold increases with increasing MW. However, at strongly absorbed wavelengths, the difference in the ablation thresholds is much smaller, or minimal. In parallel, bubble formation due to accumulation of gas produced by polymer and dopant decomposition differs depending on MW. For highly absorbing PS, the differences of behaviour show a less dramatic dependence on MW. These results are explained within the framework of the bulk photothermal model, according to which ejection requires that a critical number of bonds is broken. In all, they are of direct importance for the optimisation of laser processing schemes and applications and provide the first indication of explosive boiling in UV ablation of polymers. © 2007 IOP Publishing Ltd.
Description5 pags., 2 figs.,1 tab. -- Eighth International Conference on Laser Ablation
Publisher version (URL)http://dx.doi.org/10.1088/1742-6596/59/1/042
Identifiersdoi: 10.1088/1742-6596/59/1/042
issn: 1742-6588
Appears in Collections:(IQFR) Artículos
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