FT-IR PAS depth profiling investigation of polyethylene surface sulfonation

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DOIResolve DOI: http://doi.org/10.1016/0022-2860(95)09057-6
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TypeArticle
Journal titleJournal of Molecular Structure
ISSN0022-2860
Volume379
Pages7785; # of pages: 9
SubjectFT-IR PAS; Photoacoustic spectroscopy; Depth profiling; Polyethylene; Surface sulfonation
AbstractThe treatment of polymers with fuming sulfuric acid is a well-known procedure for introducing SO3H groups onto the polymer surface. FT-IR photoacoustic difference spectroscopy is used to follow the treatment of low density polyethylene with H2SO4·SO3 over the course of 24h. Using the unique depth profiling capability of photoacoustic spectroscopy, the extent of the reaction with the polymer and the distribution of the reaction products across the polymer film are monitored. The present spectroscopic results demonstrate that under the chosen conditions (room temperature and 32% SO3 in H2SO4) surface sulfonation initially dominates, but at longer reaction times (>70 min) oxidation becomes the main process. Phase modulated (PM) depth profiles reveal limited penetration of SO3HSO3 groups, while at long reaction times there is significant carboxylation of the bulk polymer. The extent of hydration into the polymer membrane parallels the extent of oxidation. The implications of the competition between surface sulfonation and bulk oxidation-hydration on the biocompatibility of low density polyethylene is discussed.
Publication date
PublisherElsevier Science B.V.
LanguageEnglish
AffiliationNRC Institute for Biodiagnostics; National Research Council Canada
Peer reviewedYes
NRC number417
NPARC number9147879
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Record identifier9e5d2e3f-9f1f-41ac-9bbf-4654e50af49e
Record created2009-06-25
Record modified2016-11-15
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