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Erosion of FEP Teflon and PMMA by VUV Radiation and Hyperthermal O or Ar Atoms

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ABSTRACT
A combination of beam-surface-scattering, quartz-crystal-microbalance, and surface-recession experiments was conducted to study the effects of various combinations of O atoms [in the O(3P) ground state], Ar atoms, and vacuum ultraviolet (VUV) light on fluorinated ethylene-propylene copolymer (FEP) Teflon and poly(methyl methacrylate) (PMMA). A laser-breakdown source was used to create hyperthermal beams containing O and O2 or Ar. A D2 lamp provided a source of VUV light. O atoms with 4 eV of translational energy or less did not react with a pristine FEP Teflon surface. Volatile O-containing reaction products were observed when the O-atom
energy was higher than 4.5 eV, and the signal increased with the O-atom energy. Significant erosion of FEP Teflon (∼20% of Kapton H) was observed when it was exposed to the hyperthermal O/O2 beam with an average O-atom energy of 5.4 eV. FEP Teflon and PMMA that were exposed to VUV light alone exhibited much less mass loss. Collision-induced dissociation by hyperthermal Ar atoms also caused mass loss, similar in magnitude to that caused by VUV light. There were no observed synergistic effects when VUV light or Ar bombardment was combined with O/O2 exposure. For both FEP Teflon and PMMA, the erosion yields caused by simultaneous
exposure to O/O2 and either VUV light or Ar atoms could be approximately predicted by adding the erosion yield caused by O/O2, acting individually, to the erosion yield caused by the individual action of either VUV light or Ar atoms.

KEYWORDS: FEP Teflon • PMMA • atomic oxygen • VUV light • collision-induced dissociation • polymer erosion • synergistic effects • low Earth orbit

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Ketersediaan

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Informasi Detail

Judul Seri

ACS Applied Materials & Interfaces

No. Panggil

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Penerbit

Washington, DC : American Chemical Society., 2009

Deskripsi Fisik

ACS Appl. Mater. Interfaces, 2009, 1 (3), 653-660

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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