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Influence of Tacticity on Polymer Surfaces Studiedby ToF-SIMS

✍ Scribed by Vanden Eynde, X.; Weng, L. T.; Bertrand, P.

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 239 KB
Volume: 25
Category: Article
ISSN: 0142-2421
DOI: 10.1002/(sici)1096-9918(199701)25:1<41::aid-sia211>3.0.co;2-t

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✦ Synopsis

Poly(methylmethacrylate) (PMMA) and polystyrene (PS) thin Ðlms of di †erent tacticities have been analysed by time-of-Ñight (ToF) SIMS in order to look for a possible inÑuence of the stereoregularity on their Ðngerprint spectra (m/z O 200). Because, at Ðrst glance, the spectra of samples with di †erent tacticities seemed rather similar, the intensity ratios between secondary ions from main polymer chain and those from pendant group were evaluated. By this procedure, it was found that isotactic PMMA can be clearly distinguished from syndiotactic and atactic PMMA. A lower concentration of the methyl-methacrylate pendant group was detected at the surface of the isotactic sample. In the case of PS, more phenyl groups were found to be present at the surface of isotactic PS and an empirical criterion is proposed to di †erentiate between atactic and isotactic PS.

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