Computational investigation into the mechanisms of UV ablation of poly(methyl methacrylate)

Manish Prasad, Patrick F. Conforti, Barbara Jane Garrison, Yaroslava G. Yingling

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Molecular dynamics simulations with an embedded Monte Carlo based reaction scheme were used to study UV ablation of poly(methyl methacrylate) (PMMA) at 157 nm. We discuss the onset of ablation, the formation and distribution of products in the plume and stress relaxation of the polymer matrix. Laser induced heating and bond-breaks are considered as ablation pathways. We show here that depending on the nature of energy deposition the evolution of ablation plume and yield composition can be quite different. If all of photon energy is converted to heat it can set off ablation via mechanical failure of the material in the heated region. Alternatively, if the photon energy goes towards breaking bonds first, it initiates chemical reactions, polymer unzipping and formation of gaseous products inside the substrate. The ejection of these molecules has a hollowing out effect on the substrate which can lead to ejection of larger chunks. No excessive pressure buildup due to creation of gaseous molecules or entrainment of larger polymer chunks is observed in this case.

Original languageEnglish (US)
Pages (from-to)6382-6385
Number of pages4
JournalApplied Surface Science
Volume253
Issue number15
DOIs
StatePublished - May 30 2007

Fingerprint

Polymethyl Methacrylate
Ablation
Polymethyl methacrylates
Polymers
Photons
Molecules
Stress relaxation
Substrates
Polymer matrix
Molecular dynamics
Chemical reactions
Heating
Lasers
Computer simulation
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Prasad, Manish ; Conforti, Patrick F. ; Garrison, Barbara Jane ; Yingling, Yaroslava G. / Computational investigation into the mechanisms of UV ablation of poly(methyl methacrylate). In: Applied Surface Science. 2007 ; Vol. 253, No. 15. pp. 6382-6385.
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Computational investigation into the mechanisms of UV ablation of poly(methyl methacrylate). / Prasad, Manish; Conforti, Patrick F.; Garrison, Barbara Jane; Yingling, Yaroslava G.

In: Applied Surface Science, Vol. 253, No. 15, 30.05.2007, p. 6382-6385.

Research output: Contribution to journalArticle

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