Quantitative analysis of styrene-pentafluorostyrene random copolymers by ToF-SIMS and XPS

Lu Tao Weng, Kai Mo Ng, Zhuo Lin Cheung, Yuguo Lei, Chi Ming Chan

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Poly(styrene) (PS), poly(2,3,4,5,6-pentafluorostyrene) (5FPS) and their random copolymers were prepared by bulk radical polymerization. The spin-cast polymer films of these polymers were analyzed using X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The surface and bulk compositions of these copolymers were found to be same, implying that surface segregation did not occur. The detailed analysis of ToF-SIMS spectra indicated that the ion fragmentation mechanism is similar for both PS and 5FPS. ToF-SIMS quantitative analysis using absolute peak intensity showed that the SIMS intensities of positive styrene fragments, particularly C7H7+, in the copolymers are higher than the intensities expected from a linear combination of PS and 5FPS, while the SIMS intensities of positive pentafluorostyrene fragments are smaller than expected. These results indicated the presence of matrix effects in ion formation process. However, the quantitative approach using relative peak intensity showed that ion intensity ratios are linearly proportional to the copolymer mole ratio when the characteristic ions of PS and 5FPS are selected. This suggests that quantitative analysis is still possible in this copolymer system.

Original languageEnglish (US)
Pages (from-to)32-43
Number of pages12
JournalSurface and Interface Analysis
Volume38
Issue number1
DOIs
StatePublished - Jan 1 2006

Keywords

  • Copolymers
  • Quantification
  • ToF-SIMS
  • XPS

ASJC Scopus subject areas

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

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