期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 35, 页码 20393-20404出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp505519g
关键词
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资金
- BAM trough the Adolf-Martens fellowship program
- Austrian Science Found (FWF) through the Erwin-Schrodinger fellowship program [J 3471-N28]
- European Union through the European Metrology Research Program (EMRP)
- EMRP within EURAMET
- European Union
- Austrian Science Fund (FWF) [J 3471] Funding Source: researchfish
We report a surface analytical study of poly(methyl methacrylate) (PMMA) microparticles (beads) with a grafted shell of poly(acrylic acid) (PAA) with thicknesses up to 4 nm using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and near-edge X-ray adsorption fine structure (NEXAFS) spectroscopy. These polymer microparticles were analyzed before and after reaction of the surface carboxyl (CO2H) groups with 2,2,2-trifluoroethylamine (TFEA) to gain a better understanding of methods with use of covalently bound probe molecules for surface group analysis. The results obtained with chemical derivatization XPS using TFEA are discussed in terms of surface quantification of reactive CO2H groups on these PAA-coated microparticles. A labeling yield of about 50% was found for TFEA-derivatized particles with amounts of surface-grafted CO2H groups of 99 mu mol/g or more, which is consistent with predicted reaction yields for homogeneously dispersed PAA hydrogels.
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