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Volumn 108, Issue 22, 2004, Pages 7052-7060

Product formation in the laser irradiation of doped poly(methyl methacrylate) at 248 nm: Implications for chemical effects in UV ablation

Author keywords

[No Author keywords available]

Indexed keywords

DOPING (ADDITIVES); FREE RADICALS; LASER ABLATION; LASER BEAM EFFECTS; MOLECULAR WEIGHT; PHOTODEGRADATION; PLASTIC FILMS; VISCOSITY;

EID: 2942735374     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp031116v     Document Type: Article
Times cited : (20)

References (74)
  • 9
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    • Vertes, A., Gijbels, R., Adams, F., Eds.; John Wiley: New York
    • Vertes, A.; Gijbels, R. In Laser Ionization Mass Analysis; Vertes, A., Gijbels, R., Adams, F., Eds.; John Wiley: New York, 1993; p 127.
    • (1993) Laser Ionization Mass Analysis , pp. 127
    • Vertes, A.1    Gijbels, R.2
  • 11
    • 0003305115 scopus 로고    scopus 로고
    • SPIE Proceedings Series 3254; SPIE: Bellingham, WA
    • Laser-Tissue Interaction IX; Jacques, S. L., Ed.; SPIE Proceedings Series 3254; SPIE: Bellingham, WA, 1998.
    • (1998) Laser-tissue Interaction IX
    • Jacques, S.L.1
  • 18
    • 0004283843 scopus 로고
    • Carl Hanser Verlag Publishers: Munich
    • Schuabel, W. Polymer degradation; Carl Hanser Verlag Publishers: Munich, 1981.
    • (1981) Polymer Degradation
    • Schuabel, W.1
  • 32
    • 2942757641 scopus 로고    scopus 로고
    • note
    • Products from irradiated (raster-scanned) films were extracted in hexane and analyzed on a Shimadzu GC17A gas Chromatograph, with a Supelco SBP-5 fused silica capillary, coupled with a Shimadzu GCMS-QP 5050 mass-selective detector (70 eV nominal ionization energy).
  • 39
    • 2942742567 scopus 로고    scopus 로고
    • note
    • Attempts to quantify this influence through the use of fluorescing organic dopants proved unsuccessful because all tested compounds were found to be photochemically unstable or to desorb at these laser fluences.
  • 44
    • 2942727505 scopus 로고    scopus 로고
    • note
    • For Ar-substituted PMMA products, the fluorescence yields should be comparable, independent of the polymer chain size, so that changes in product distribution may not affect the total product fluorescence intensity much. At any rate, as shown, the influence of ablation/temperature increase on radical reactivity is so pronounced that differences in the product distribution are of secondary importance.
  • 61
    • 2942712901 scopus 로고    scopus 로고
    • note
    • -2). The main error is introduced by the parallel increase in the substrate absorptivity, due to the accumulation of Ar-deriving and PMMA decomposition products. Thus, the condition of the optically thin sample is not satisfied after extensive irradiation.
  • 62
    • 2942742479 scopus 로고    scopus 로고
    • note
    • The dependence on concentration may not follow the expected second-order law because a change in the NapI concentration affects, in parallel, the amount of absorbed energy and thus the extent of thermal decomposition of the polymer.
  • 72
    • 2942713017 scopus 로고    scopus 로고
    • Bounos, G.; Georgiou, S., unpublished results
    • Bounos, G.; Georgiou, S., unpublished results.
  • 73
    • 2942727953 scopus 로고    scopus 로고
    • note
    • Strictly speaking, the term "cage effects" refers to the promotion of recombination. Here, we include the possibility that below the threshold, NapH fluorescence may be quenched by the counterpart, I (i.e., external heavy atom effect). For the purposes of this study, this "looser" use of the term is immaterial.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.